MCQOPTIONS
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MCQOPTIONS
This section includes 1187 Mcqs, each offering curated multiple-choice questions to sharpen your NEET knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
Which physical property of dihydrogen is wrong? |
| A. | Odourless gas |
| B. | Tasteless gas |
| C. | Colourless gas |
| D. | Non-inflammable gas |
| Answer» E. | |
| 202. |
When a substance Areacts with water it produces a combustible gas B and a solution of substance C in water. When another substance D reacts with this solution of C, it also produces the same gas B on warming but D can produce gas B on reaction with dilute sulphuric acid at room temperature. A imparts a deep golden yellow colour to a smokeless flame of Bunsen burner. A, B, C and D respectively are |
| A. | \[Na,{{H}_{2}},NaOH,Zn\] |
| B. | \[K,{{H}_{2}},KOH,Al\] |
| C. | \[Ca,{{H}_{2}},Ca{{\left( OH \right)}_{2}},Sn\] |
| D. | \[Ca{{C}_{2}},{{C}_{2}}{{H}_{2}},Ca{{(OH)}_{2}},Fe\] |
| Answer» B. \[K,{{H}_{2}},KOH,Al\] | |
| 203. |
\[{{H}_{2}}{{O}_{2}}\to 2{{H}^{+}}+{{O}_{2}}+2{{e}^{-}};E{}^\circ =-0.68V.\] This equation represents which of the following behaviour of\[{{H}_{2}}{{O}_{2}}\] ? |
| A. | Reducing |
| B. | Oxidising |
| C. | Acidic |
| D. | Catalytic |
| Answer» B. Oxidising | |
| 204. |
A 5.0 mL solution of \[{{H}_{2}}{{O}_{2}}\] liberates 1.27 g of iodine from an acidified KI solution. The percentage strength of \[{{H}_{2}}{{O}_{2}}\] is |
| A. | 11.2 |
| B. | 5.6 |
| C. | 1.7 |
| D. | 3.4 |
| Answer» E. | |
| 205. |
3.4 g sample of \[{{H}_{2}}{{O}_{2}}\] solution containing x% \[{{H}_{2}}{{O}_{2}}\] by weight requires x mL of \[KMn{{O}_{4}}\]solution for complete oxidation under acidic condition. The normality of \[KMn{{O}_{4}}\] solution is |
| A. | IN |
| B. | 2N |
| C. | 3N |
| D. | 0.5N |
| Answer» C. 3N | |
| 206. |
Hydrogen can be fused to form helium at |
| A. | high temperature and high pressure |
| B. | high temperature and low pressure |
| C. | low temperature and high pressure |
| D. | low temperature and low pressure |
| Answer» B. high temperature and low pressure | |
| 207. |
When electric current is passed through an ionic hydride in molten state: |
| A. | hydrogen is liberated at anode |
| B. | hydrogen is liberated at cathode |
| C. | hydride ion migrates towards cathode |
| D. | hydride ion remains is solution |
| Answer» B. hydrogen is liberated at cathode | |
| 208. |
\[C{{H}_{3}}-\overset{C{{H}_{3}}}{\mathop{\overset{|}{\mathop{CH}}\,}}\,C\equiv CH~\xrightarrow{excess\,\,HBr}\] The product of the above reaction is: |
| A. | \[C{{H}_{3}}-\overset{C{{H}_{3}}}{\mathop{\overset{|}{\mathop{CH}}\,}}\,-\overset{Br}{\mathop{\overset{|}{\mathop{C}}\,}}\,={{\overset{Br}{\mathop{\overset{|}{\mathop{CH}}\,}}\,}_{2}}\] |
| B. | \[C{{H}_{3}}-\overset{C{{H}_{3}}}{\mathop{\overset{|}{\mathop{CH}}\,}}\,-\overset{Br}{\mathop{\overset{|}{\mathop{C}}\,}}\,=C{{H}_{2}}\] |
| C. | \[C{{H}_{3}}-\overset{C{{H}_{3}}}{\mathop{\overset{|}{\mathop{CH}}\,}}\,-\underset{Br}{\mathop{\underset{|}{\mathop{\overset{Br}{\mathop{\overset{|}{\mathop{C}}\,}}\,}}\,}}\,=C{{H}_{3}}\] |
| D. | \[C{{H}_{3}}-\overset{C{{H}_{3}}}{\mathop{\overset{|}{\mathop{CH}}\,}}\,-C{{H}_{2}}-\underset{Br}{\mathop{\underset{|}{\mathop{\overset{Br}{\mathop{\overset{|}{\mathop{CH}}\,}}\,}}\,}}\,\] |
| Answer» D. \[C{{H}_{3}}-\overset{C{{H}_{3}}}{\mathop{\overset{|}{\mathop{CH}}\,}}\,-C{{H}_{2}}-\underset{Br}{\mathop{\underset{|}{\mathop{\overset{Br}{\mathop{\overset{|}{\mathop{CH}}\,}}\,}}\,}}\,\] | |
| 209. |
Which of the following statements is incorrect regarding dehydrohalogenation of alkenes? |
| A. | During the reaction hydrogen atom is eliminated from the P - carbon atom. |
| B. | Rate of reaction for same alkyi group; Iodine > Bromine > Chlorine |
| C. | Rate of reaction; \[{{(C{{H}_{3}})}_{3}}C->{{(C{{H}_{3}})}_{2}}CH->C{{H}_{3}}C{{H}_{2}}-\] |
| D. | Only nature of halogen atom determine rate of the reaction. |
| Answer» E. | |
| 210. |
Arrange the following in decreasing order of reactivity towards EAS (electrophilic aromatic substitution) |
| A. | a > b > c |
| B. | c > b > a |
| C. | a > c > b |
| D. | c > a > b |
| Answer» B. c > b > a | |
| 211. |
Identify the position where electrophilic aromatic substitution (EAS) is most favourable. |
| A. | A |
| B. | B |
| C. | C |
| D. | A and C |
| Answer» C. C | |
| 212. |
The two compounds A and B obtained from 1-butyne can be distinguished by \[B\xleftarrow[(ii)\,{{H}_{2}}{{O}_{2}}]{(i)\,B{{H}_{3}}}C{{H}_{3}}C{{H}_{2}}C\equiv CH\xrightarrow{{{H}^{+}}/H{{g}^{2+}}}A\] |
| A. | \[NaHS{{O}_{3}}\] |
| B. | litmus solution |
| C. | iodoform test |
| D. | 2, 4-DNP |
| Answer» D. 2, 4-DNP | |
| 213. |
The hydration of propyne results in formation of |
| A. | Acetone |
| B. | Propanol-1 |
| C. | Propene |
| D. | Propanal |
| Answer» B. Propanol-1 | |
| 214. |
Which of the following will yield a mixture of 2-chlorobutene and 3-chlorobutene on treatment with\[HCl\]? |
| A. | \[C{{H}_{2}}=C=CH-C{{H}_{3}}\] |
| B. | \[{{H}_{2}}C=\underset{C{{H}_{3}}}{\mathop{\underset{|}{\mathop{C}}\,}}\,-CH=C{{H}_{2}}\] |
| C. | \[C{{H}_{2}}=CH-CH=C{{H}_{2}}\] |
| D. | \[HC\equiv C-CH=C{{H}_{2}}\] |
| Answer» B. \[{{H}_{2}}C=\underset{C{{H}_{3}}}{\mathop{\underset{|}{\mathop{C}}\,}}\,-CH=C{{H}_{2}}\] | |
| 215. |
Which one of the following class of compounds is obtained by polymerization of acetylene? |
| A. | Poly-yne |
| B. | Poly-ene |
| C. | Poly-ester |
| D. | Poly-amine |
| Answer» C. Poly-ester | |
| 216. |
An unknown compound A has a molecular formula \[{{C}_{2}}{{H}_{6}}\], when A is treated with an excess of\[B{{r}_{2}}\], a new substance B with formula \[{{C}_{4}}{{H}_{6}}B{{r}_{2}}\]is formed. A forms a white precipitate with ammonical silver nitrate solution. A may be |
| A. | Butyne-1 |
| B. | Butyne-2 |
| C. | Butene-1 |
| D. | Butene-2 |
| Answer» B. Butyne-2 | |
| 217. |
Identify the reagent from the following list which can easily distinguish between 1-butyne and 2-butyne |
| A. | bromine, \[CC{{l}_{4}}\] |
| B. | \[{{H}_{2}}\], Lindlar catalyst |
| C. | dilute \[{{H}_{2}}S{{O}_{4}}\], \[HgS{{O}_{4}}\] |
| D. | ammonical \[C{{u}_{2}}C{{l}_{2}}\] solution |
| Answer» E. | |
| 218. |
The principal organic product formed in the reaction, \[C{{H}_{2}}=CH{{(C{{H}_{2}})}_{8}}COOH+HBr\,\xrightarrow{peroxide}\] is |
| A. | \[C{{H}_{3}}CHBr{{(C{{H}_{2}})}_{8}}COOH\] |
| B. | \[C{{H}_{2}}=CH{{(C{{H}_{2}})}_{8}}COBr\] |
| C. | \[C{{H}_{2}}BrC{{H}_{2}}{{(C{{H}_{2}})}_{8}}COOH\] |
| D. | \[C{{H}_{2}}=CH{{(C{{H}_{2}})}_{7}}CHBrCOOH\] |
| Answer» D. \[C{{H}_{2}}=CH{{(C{{H}_{2}})}_{7}}CHBrCOOH\] | |
| 219. |
Addition of HI to double bond of propene yields isopropyl iodide and not n-propyl iodide as the major product, because addition proceeds through |
| A. | a more stable carbonium ion |
| B. | a more stabi e carban ion |
| C. | a more stable free radical |
| D. | homolysis |
| Answer» B. a more stabi e carban ion | |
| 220. |
The reagent needed for converting |
| A. | Cat. Hydrogenation |
| B. | \[{{H}_{2}}\]/Lindlar Cat. |
| C. | \[Li/N{{H}_{3}}\] |
| D. | \[LiAl{{H}_{4}}\] |
| Answer» D. \[LiAl{{H}_{4}}\] | |
| 221. |
An alkene having molecular formula \[{{C}_{7}}{{H}_{14}}\] was subjected to ozonolysis in the presence of zinc dust. An equimolar amount of the following two compounds was obtained The IUPAC name of the alkene is |
| A. | 3, 4-dimethyl-3-pentene |
| B. | 3, 4-dimethyl-2-pentene |
| C. | 2, 3-dimethyl-3-pentene |
| D. | 2, 3-dimethyl-2-pentene |
| Answer» E. | |
| 222. |
In reaction sequence \[C{{H}_{2}}=C{{H}_{2}}\xrightarrow[acid]{Hypochlorous}M\xrightarrow{R}\underset{C{{H}_{2}}OH}{\overset{C{{H}_{2}}OH}{\mathop{|}}}\,\] molecule 'M' and reagent 'R' respectively are |
| A. | \[C{{H}_{3}}C{{H}_{2}}Cl\] and \[NaOH\] |
| B. | \[C{{H}_{3}}C{{H}_{2}}OH\] and \[{{H}_{2}}S{{O}_{4}}\] |
| C. | \[C{{H}_{2}}(Cl)C{{H}_{2}}OH\] and aqueous \[NaHC{{O}_{3}}\] |
| D. | and Heat |
| Answer» D. and Heat | |
| 223. |
How many monochlorolmtanes will be obtained on chlorination of n-butane? |
| A. | 5 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 224. |
Consider the following sequence of reactions \[C{{H}_{3}}CH=C{{H}_{2}}\xrightarrow[700k]{C{{l}_{2}}}A\xrightarrow[420k,\,12\,atm]{N{{a}_{2}}C{{O}_{3}}}B\] Compound 'B' is |
| A. | |
| B. | \[C{{H}_{3}}CH\underset{OH}{\mathop{\underset{|}{\mathop{C}}\,}}\,OONa\] |
| C. | \[HOC{{H}_{2}}-CH=C{{H}_{2}}\] |
| D. | \[C{{H}_{3}}\underset{OH}{\mathop{\underset{|}{\mathop{C}}\,}}\,HOCl\] |
| Answer» B. \[C{{H}_{3}}CH\underset{OH}{\mathop{\underset{|}{\mathop{C}}\,}}\,OONa\] | |
| 225. |
In the presence of peroxide, \[HCl\] and HI do not give anti-Markownikoff's addition of alkenes because: |
| A. | One of the steps is endothermic in \[HCl\] and HI |
| B. | Both \[HCl\] and HI are strong acids |
| C. | \[HCl\] is oxidizing and the HI is reducing |
| D. | All the steps are exothermic is \[HCl\] and HI |
| Answer» B. Both \[HCl\] and HI are strong acids | |
| 226. |
[A] Double bond equivalent (degree of unsaturation) of [A] is: |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 227. |
Among the following free radical bromination reactions, select those in which \[2{}^\circ \] halide is the major product (P) (Q) (R) (S) (T) (U) |
| A. | P, Q, R, S |
| B. | P, R, U |
| C. | P, R, S, T |
| D. | P, Q, R, S, T |
| Answer» C. P, R, S, T | |
| 228. |
Toluene on treatment with \[Cr{{O}_{3}}\] and \[{{(C{{H}_{3}}CO)}_{2}}O\] followed by hydrolysis with dil. \[HCl\] gives |
| A. | benzaldehyde |
| B. | benzoicacid |
| C. | phenol |
| D. | phenylacetaldehyde |
| Answer» B. benzoicacid | |
| 229. |
\[HOCl\] reacts on 3-methyl-2-pentene, the main product will be: |
| A. | \[C{{H}_{3}}-CH=\underset{Cl}{\mathop{\underset{|}{\mathop{C}}\,}}\,-CH-(OH)-C{{H}_{3}}\] |
| B. | \[C{{H}_{3}}-\overset{OH}{\mathop{\overset{|}{\mathop{C}}\,}}\,H-\overset{C{{H}_{3}}}{\mathop{\overset{|}{\mathop{\underset{Cl}{\mathop{\underset{|}{\mathop{C}}\,}}\,}}\,}}\,-C{{H}_{2}}-C{{H}_{3}}\] |
| C. | \[C{{H}_{3}}-\overset{Cl}{\mathop{\overset{|}{\mathop{C}}\,}}\,H-\overset{C{{H}_{3}}}{\mathop{\overset{|}{\mathop{\underset{OH}{\mathop{\underset{|}{\mathop{C}}\,}}\,}}\,}}\,-C{{H}_{2}}-C{{H}_{3}}\] |
| D. | None of these |
| Answer» D. None of these | |
| 230. |
Which of the following types of reaction occur when a reactant has got a double bond?(i) Addition(ii) Photolysis(iii) Nucleophilic substitution(iv) Polymerization |
| A. | (i) and (iv) |
| B. | (i) and (ii) |
| C. | (i), (ii) and (iv) |
| D. | (i),(ii),(iii) and (iv) |
| Answer» B. (i) and (ii) | |
| 231. |
Which one of the following reactions is expected to readily give a hydrocarbon product in good yields? |
| A. | \[RCOOK~\xrightarrow[oxidation]{Electrolytic}\] |
| B. | \[RCO{{O}^{-}}A{{g}^{+}}\xrightarrow{B{{r}_{2}}}\] |
| C. | \[C{{H}_{3}}C{{H}_{3}}\xrightarrow[hv]{C{{l}_{2}}}\] |
| D. | \[{{(C{{H}_{3}})}_{3}}CCl\ \xrightarrow{{{C}_{2}}{{H}_{5}}OH}\] |
| Answer» B. \[RCO{{O}^{-}}A{{g}^{+}}\xrightarrow{B{{r}_{2}}}\] | |
| 232. |
Which one of the following compounds would have the highest heat of hydrogenation? |
| A. | \[C{{H}_{2}}=C{{H}_{2}}\] |
| B. | \[C{{H}_{3}}-C{{H}_{2}}-CH=C{{H}_{2}}\] |
| C. | \[C{{H}_{3}}CH=CHC{{H}_{3}}\] |
| D. | \[{{\left( C{{H}_{3}} \right)}_{2}}C=C{{\left( C{{H}_{3}} \right)}_{2}}\] |
| Answer» B. \[C{{H}_{3}}-C{{H}_{2}}-CH=C{{H}_{2}}\] | |
| 233. |
In preparation of alkene from alcohol using \[A{{l}_{2}}{{O}_{3}}\] which is effective factor? |
| A. | Porosity of \[A{{l}_{2}}{{O}_{3}}\] |
| B. | Temperature |
| C. | Concentration |
| D. | Surface area of \[A{{l}_{2}}{{O}_{3}}\] |
| Answer» E. | |
| 234. |
In the hydroboration - oxidation reaction of propene with diborane, \[{{H}_{2}}{{O}_{2}}\] and \[NaOH,\] the organic compound formed is: |
| A. | \[C{{H}_{3}}C{{H}_{2}}OH\] |
| B. | \[C{{H}_{3}}CHOHC{{H}_{3}}\] |
| C. | \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}OH\] |
| D. | \[{{(C{{H}_{3}})}_{3}}COH\] |
| Answer» D. \[{{(C{{H}_{3}})}_{3}}COH\] | |
| 235. |
The major product obtained in the photo catalysed bromination of 2-methylbutane is: |
| A. | 1-bromo-2-methylbutane |
| B. | 1-bromo-3-methylbutane |
| C. | 2-bromo-3-methylbutane |
| D. | 2-bromo-2-methylbutane |
| Answer» E. | |
| 236. |
Compare rate of dehydration of (I), (II) and (III) by cone.\[{{H}_{2}}S{{O}_{4}}\]. I. II. III. |
| A. | (I) > (III) > (II) |
| B. | (I) > (II) > (Ill) |
| C. | (II) > (I) > (III) |
| D. | (II) > (III) > (I) |
| Answer» C. (II) > (I) > (III) | |
| 237. |
Which of the following compounds are antiaromatic |
| A. | (l) and (V) |
| B. | (II) and (V) |
| C. | (I) and (IV) |
| D. | (V) and (VI) |
| Answer» E. | |
| 238. |
A compound (X) \[({{C}_{5}}{{H}_{8}})\] reacts with ammonical \[AgN{{O}_{3}}\] to give a white precipitate, and on oxidation with hot alkaline \[KMn{{O}_{4}}\] gives the acid, \[{{(C{{H}_{3}})}_{2}}CHCOOH\], therefore X is - |
| A. | \[C{{H}_{2}}=CH-CH=CH-C{{H}_{3}}\] |
| B. | \[C{{H}_{3}}-CH=CH-C{{H}_{2}}-C{{H}_{3}}\] |
| C. | \[{{(C{{H}_{3}})}_{2}}CH-C=CH\] |
| D. | \[{{(C{{H}_{3}})}_{2}}C=C\equiv C{{H}_{2}}\] |
| Answer» D. \[{{(C{{H}_{3}})}_{2}}C=C\equiv C{{H}_{2}}\] | |
| 239. |
Consider the following reaction \[{{H}_{3}}C-\underset{D}{\mathop{\underset{|}{\mathop{CH}}\,}}\,-\underset{C{{H}_{3}}}{\mathop{\underset{|}{\mathop{CH}}\,}}\,-C{{H}_{3}}+\overset{\bullet }{\mathop{B}}\,r\xrightarrow{{}}'X'+HBr\] Identify the structure of the major product 'X' |
| A. | \[{{H}_{3}}C-\underset{D}{\mathop{\underset{|}{\mathop{C}}\,}}\,H-\underset{C{{H}_{3}}}{\mathop{\underset{|}{\mathop{C}}\,}}\,H-\overset{\bullet }{\mathop{C}}\,{{H}_{2}}\] |
| B. | \[{{H}_{3}}C-\underset{D}{\mathop{\underset{|}{\mathop{C}}\,}}\,H-\overset{\bullet }{\mathop{\underset{C{{H}_{3}}}{\mathop{\underset{|}{\mathop{C}}\,}}\,}}\,-\overset{{}}{\mathop{C}}\,{{H}_{2}}\] |
| C. | \[{{H}_{3}}C-\overset{\bullet }{\mathop{\underset{D}{\mathop{\underset{|}{\mathop{C}}\,}}\,}}\,-\overset{{}}{\mathop{\underset{C{{H}_{3}}}{\mathop{\underset{|}{\mathop{CH}}\,}}\,}}\,-\overset{{}}{\mathop{C}}\,{{H}_{3}}\] |
| D. | \[{{H}_{3}}C-\overset{\bullet }{\mathop{CH}}\,-\overset{{}}{\mathop{\underset{C{{H}_{3}}}{\mathop{\underset{|}{\mathop{CH}}\,}}\,}}\,-\overset{{}}{\mathop{C}}\,{{H}_{3}}\] |
| Answer» C. \[{{H}_{3}}C-\overset{\bullet }{\mathop{\underset{D}{\mathop{\underset{|}{\mathop{C}}\,}}\,}}\,-\overset{{}}{\mathop{\underset{C{{H}_{3}}}{\mathop{\underset{|}{\mathop{CH}}\,}}\,}}\,-\overset{{}}{\mathop{C}}\,{{H}_{3}}\] | |
| 240. |
\[B{{r}^{\bullet }}\] will abstract which of the hydrogen most readily? |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| Answer» B. b | |
| 241. |
What is the end product of the following sequences of operations? \[Ca{{C}_{2}}\xrightarrow{{{H}_{2}}O}A\xrightarrow[H{{g}^{2+}}]{dil.\,{{H}_{2}}S{{O}_{4}}}B\xrightarrow[{{H}_{2}}]{Ni}C\] |
| A. | Methyl alcohol |
| B. | Acetaldehyde |
| C. | \[{{C}_{2}}{{H}_{5}}OH\] |
| D. | \[{{C}_{2}}{{H}_{4}}\] |
| Answer» D. \[{{C}_{2}}{{H}_{4}}\] | |
| 242. |
Which of the following would not give 2-phenylbutane as the major product in a Friedel- Crafts alkylation reaction on benzene ring? |
| A. | 1-butene+HF |
| B. | 2-butanol \[+{{H}_{2}}S{{O}_{4}}\] |
| C. | Butanoyl chloride \[+AlC{{l}_{3}}\] then \[Zn,HCl\] |
| D. | Butyl chloride \[+AlC{{l}_{3}}\] |
| Answer» D. Butyl chloride \[+AlC{{l}_{3}}\] | |
| 243. |
Consider the following anions. When attached to \[s{{p}^{3}}\]-hydridized carbon, their leaving group ability in nucleophilic substitution reaction decreases in the order: |
| A. | \[I>II>III>IV\] |
| B. | \[I>II>IV>III\] |
| C. | \[IV>I>II>III\] |
| D. | \[IV>III>II>I\] |
| Answer» C. \[IV>I>II>III\] | |
| 244. |
\[AgN{{O}_{3}}\] does not give precipitate with chloroform because: |
| A. | \[CHC{{l}_{3}}\] does not ionise in water. |
| B. | \[CHC{{l}_{3}}\] is insoluble in water. |
| C. | \[AgN{{O}_{3}}\] is insoluble in \[CHC{{l}_{3}}\]. |
| D. | \[CHC{{l}_{3}}\] is an organic compound. |
| Answer» B. \[CHC{{l}_{3}}\] is insoluble in water. | |
| 245. |
The order of reactivity of the given haloalkanes towards nucleophile is: |
| A. | \[RI>RBr>RCl\] |
| B. | \[RCl>RBr>RI\] |
| C. | \[RBr>RCl>RI\] |
| D. | \[RBr>RI>RCl\] |
| Answer» B. \[RCl>RBr>RI\] | |
| 246. |
Arrange the following in order of decreasing rate of solvolysis with aqueous ethanol (fastest \[\to \] slowest) (1) (2) (3) |
| A. | 2>1>3 |
| B. | 1>2>3 |
| C. | 2>3>1 |
| D. | 1>3>2 |
| Answer» D. 1>3>2 | |
| 247. |
The reaction of toluene with chlorine in presence of ferric chloride gives predominantly: |
| A. | benzoyl chloride |
| B. | m-chlorotoluene |
| C. | benzyl chloride |
| D. | o- and p-chlorotoluene |
| Answer» E. | |
| 248. |
The missing reagents \[{{R}_{1}}\] and \[{{R}_{2}}\] in the following series of reactions are \[C{{H}_{3}}C{{H}_{2}}Br\xrightarrow{{{R}_{1}}}[\,\,\,\,]\xrightarrow{{{R}_{2}}}C{{H}_{3}}\overset{-}{\mathop{C}}\,H{{P}^{+}}P{{h}_{3}}\] |
| A. | PhLi and \[P{{h}_{3}}P\] respectively |
| B. | \[P{{h}_{3}}P\] and PhLi respectively |
| C. | \[P{{h}_{3}}P\] and \[{{C}_{2}}{{H}_{5}}ONa\] respectively |
| D. | Either [b] or [c] |
| Answer» E. | |
| 249. |
X in the following reaction is - |
| A. | (+) 2, 3-Dibromobutane |
| B. | (-) 2, 3-Dibromobutane |
| C. | (\[\pm \])- 2, 3-Dibromobutane |
| D. | meso-2, 3-Dibromobutane |
| Answer» E. | |
| 250. |
\[PhCOCHB{{r}_{2}}\xrightarrow{O{{H}^{-}}}A\xrightarrow{O{{H}^{-}}}B\xrightarrow{{{H}^{+}}}C\] The compound C is - |
| A. | \[PhCH\left( OH \right)CHO\] |
| B. | \[PhCH\left( OH \right)COOH\] |
| C. | \[PhCO\underset{H}{\mathop{\underset{|}{\mathop{C}}\,}}\,B{{r}_{2}}\] |
| D. | \[Ph-\underset{O}{\mathop{\underset{||}{\mathop{C}}\,}}\,-C{{H}_{2}}-OH\] |
| Answer» C. \[PhCO\underset{H}{\mathop{\underset{|}{\mathop{C}}\,}}\,B{{r}_{2}}\] | |