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MCQOPTIONS
This section includes 11242 Mcqs, each offering curated multiple-choice questions to sharpen your Joint Entrance Exam - Main (JEE Main) knowledge and support exam preparation. Choose a topic below to get started.
| 7301. |
A white crystalline substance dissolves in water. On passing \[{{H}_{2}}S\] in this solution, a black precipitate is obtained. The black precipitate dissolves completely in hot \[HN{{O}_{3}}\]. On adding a few drops of conc. \[{{H}_{2}}S{{O}_{4}}\] a white precipitate is obtained. This precipitate is that of [CPMT 1990] |
| A. | \[BaS{{O}_{4}}\] |
| B. | \[SrS{{O}_{4}}\] |
| C. | \[PbS{{O}_{4}}\] |
| D. | \[CdS{{O}_{4}}\] |
| Answer» D. \[CdS{{O}_{4}}\] | |
| 7302. |
A chemistry student trying to detect the metallic ion in a salt, makes a paste on a clean platinum wire loop of the salt with concentrated \[HCl\]. When he takes a small amount of this paste and keeps it in a non-luminous Bunsen flame, the colour of the flame changes to grassy green. He should, therefore, conclude that the metal is [Manipal MEE 1995] |
| A. | Barium |
| B. | Calcium |
| C. | Potassium |
| D. | Strontium |
| Answer» B. Calcium | |
| 7303. |
To a 25 ml of \[{{H}_{2}}{{O}_{2}}\]solution, excess of acidified solution of KI was mixed. The liberated I2 require 20ml of 0.3M hypo solution for neutralization. The volume strength of \[{{H}_{2}}{{O}_{2}}\] will be [MP PET 2003] |
| A. | 1.34 ml |
| B. | 1.44 ml |
| C. | 1.60 ml |
| D. | 2.42 ml |
| Answer» B. 1.44 ml | |
| 7304. |
10 ml of concentrated \[HCl\] were diluted to 1 litre. 20 ml of this diluted solution required 25 ml of 0.1 N sodium hydroxide solution for complete neutralization, the normality of the concentrated hydrochloric acid will be |
| A. | 8 |
| B. | 9.5 |
| C. | 12.5 |
| D. | 15 |
| Answer» D. 15 | |
| 7305. |
Three separate samples of a solution of a single salt gave these test results : One formed a white precipitate with excess ammonia solution, one formed a white precipitate with dil. \[NaCl\] solution and one formed a black precipitate with \[{{H}_{2}}S\]. The salt could be [Pb. PMT 1998] |
| A. | \[AgN{{O}_{3}}\] |
| B. | \[Pb{{\left( N{{O}_{3}} \right)}_{2}}\] |
| C. | \[Hg{{\left( N{{O}_{3}} \right)}_{2}}\] |
| D. | \[MnS{{O}_{4}}\] |
| Answer» B. \[Pb{{\left( N{{O}_{3}} \right)}_{2}}\] | |
| 7306. |
Phosphoric acid \[\left( {{H}_{3}}P{{O}_{4}} \right)\] is tribasic acid and one of its salts is sodium dihydrogen phosphate \[\left( Na{{H}_{2}}P{{O}_{4}} \right)\]. What volume of 1 M \[NaOH\] solution should be added to 12 g of sodium dihydrogen phosphate (mol. wt. 120) to exactly convert it into trisodium phosphate \[N{{a}_{3}}P{{O}_{4}}\] [Kurukshetra CET 1998] |
| A. | 80 ml |
| B. | 100 ml |
| C. | 200 ml |
| D. | 300 ml |
| Answer» D. 300 ml | |
| 7307. |
An aqueous solution of \[FeS{{O}_{4}},A{{l}_{2}}{{\left( S{{O}_{4}} \right)}_{3}}\] and chrome alum is heated with excess of \[N{{a}_{2}}{{O}_{2}}\] and filtered. The materials obtained are [IIT 1996] |
| A. | A colourless filtrate and a green residue |
| B. | A yellow filtrate and a green residue |
| C. | A yellow filtrate and a brown residue |
| D. | A green filtrate and a brown residue |
| Answer» D. A green filtrate and a brown residue | |
| 7308. |
A red solid is insoluble in water. However it becomes soluble if some KI is added to water. Heating the red solid in a test tube results in liberation of some violet coloured fumes and droplets of a metal appear on the cooler parts of the test tube. The red solid is [AIEEE 2003] |
| A. | \[{{\left( N{{H}_{4}} \right)}_{2}}C{{r}_{2}}{{O}_{7}}\] |
| B. | \[Hg{{I}_{2}}\] |
| C. | \[HgO\] |
| D. | \[P{{b}_{3}}{{O}_{4}}\] |
| Answer» C. \[HgO\] | |
| 7309. |
On performing a borax-bead test with a given inorganic mixture for qualitative analysis, the colour of the bead was found to be emerald green both in oxidising and reducing flame. It indicates the possibility of the presence of [MP PMT 2001] |
| A. | \[C{{o}^{+2}}\] |
| B. | \[N{{i}^{+2}}~~~~~~\] |
| C. | \[C{{r}^{+3}}\] |
| D. | \[C{{u}^{+2}}\] |
| Answer» D. \[C{{u}^{+2}}\] | |
| 7310. |
A white solid 'A' on heating gives off a gas which turns lime water milky. The residue is yellow when hot but turns white on cooling. This solid 'A' is [MP PMT 1999] |
| A. | Zinc sulphate |
| B. | Zinc carbonate |
| C. | Lead sulphate |
| D. | Lead carbonate |
| Answer» C. Lead sulphate | |
| 7311. |
The enol form of acetone, after treatment with \[{{D}_{2}}O,\] gives [IIT-JEE (Screening) 1999] |
| A. | \[C{{H}_{3}}-\overset{OD\,\,\,\,\,\,\,\,\,\,}{\mathop{\overset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{C=C{{H}_{2}}}}\,}}\,\] |
| B. | \[C{{D}_{3}}-\overset{O\,\,}{\mathop{\overset{||\,\,\,\,}{\mathop{C-}}\,}}\,C{{D}_{3}}\] |
| C. | \[C{{H}_{2}}=\overset{\,OH}{\mathop{\overset{|\,\,\,\,\,}{\mathop{C-}}\,}}\,C{{H}_{2}}D\] |
| D. | \[C{{D}_{2}}=\overset{OD}{\mathop{\overset{|\,\,\,\,\,}{\mathop{C-}}\,}}\,CD\] |
| Answer» C. \[C{{H}_{2}}=\overset{\,OH}{\mathop{\overset{|\,\,\,\,\,}{\mathop{C-}}\,}}\,C{{H}_{2}}D\] | |
| 7312. |
Which is not true about acetophenone [Manipal 2002] |
| A. | Reacts to form 2, 4-dinitorphenyl hydrazine |
| B. | Reacts with Tollen?s reagent to form silver mirror |
| C. | Reacts with \[{{I}_{2}}/NaOH\] to form iodoform |
| D. | On oxidation with alkaline \[KMn{{O}_{4}}\] followed by hydrolysis gives benzoic acid |
| Answer» C. Reacts with \[{{I}_{2}}/NaOH\] to form iodoform | |
| 7313. |
Compound ?A? (molecular formula \[{{C}_{3}}{{H}_{8}}O)\] is treated with acidified potassium dichromate to form a product ?B? (molecular formula \[{{C}_{3}}{{H}_{6}}O).\] ?B? forms a shining silver mirror on warming with ammoniacal silver nitrate. ?B? when treated with an aqueous solution of \[{{H}_{2}}NCONHN{{H}_{2}}.HCl\] and sodium acetate gives a product ?C?. Identify the structure of ?C? [IIT-JEE (Screening) 2002] |
| A. | \[C{{H}_{3}}C{{H}_{2}}CH=NNHCON{{H}_{2}}\] |
| B. | \[C{{H}_{3}}-CH=\underset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,}{\mathop{NNH}}\,}}\,CON{{H}_{2}}\] |
| C. | \[C{{H}_{3}}CH=\underset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,}{\mathop{NCO}}\,}}\,NHN{{H}_{2}}\] |
| D. | \[C{{H}_{3}}C{{H}_{2}}CH-NCONHN{{H}_{2}}\] |
| Answer» B. \[C{{H}_{3}}-CH=\underset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,}{\mathop{NNH}}\,}}\,CON{{H}_{2}}\] | |
| 7314. |
Which alkene is formed from the following reaction \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}CH=PP{{h}_{3}}+2-\,\text{Butanone}\] [Manipal 2001] |
| A. | 3- Methyl-3-heptene |
| B. | 4-Methyl-3-heptene |
| C. | 5-Methyl-3-heptene |
| D. | 1-Methyl-5- methane |
| Answer» B. 4-Methyl-3-heptene | |
| 7315. |
An organic compound 'A' has the molecular formula \[{{C}_{3}}{{H}_{6}}O,\] it undergoes iodoform test. When saturated with dil. \[HCl\] is gives 'B' of molecular formula \[{{C}_{9}}{{H}_{14}}O\]. A and B respectively are [Tamil Nadu CET 2002] |
| A. | Propanal and mesitylene |
| B. | Propanone and mesityl oxide |
| C. | Propanone and 2,6-dimethyl -2, 5-heptadien-4-one |
| D. | Propanone and mesitylene oxide |
| Answer» D. Propanone and mesitylene oxide | |
| 7316. |
A compound, containing only carbon, hydrogen and oxygen, has a molecular weight of 44. On complete oxidation it is converted into a compound of molecular weight 60. The original compound is [KCET 2005] |
| A. | An aldehyde |
| B. | An acid |
| C. | An alcohol |
| D. | an ether |
| Answer» B. An acid | |
| 7317. |
Products of the following reaction \[C{{H}_{3}}C\equiv C\,C{{H}_{2}}C{{H}_{3}}\underset{(2)\,Hydrolysis}{\mathop{\xrightarrow{(1)\,{{O}_{3}}}}}\,\,\,\,...\text{are}\] [CBSE PMT 2005] |
| A. | \[C{{H}_{3}}CHO+C{{H}_{3}}C{{H}_{2}}CHO\] |
| B. | \[C{{H}_{3}}COOH+C{{H}_{3}}C{{H}_{2}}CHO\] |
| C. | \[C{{H}_{3}}COOH+HOOCC{{H}_{2}}C{{H}_{3}}\] |
| D. | \[C{{H}_{3}}COOH+C{{O}_{2}}\] |
| Answer» D. \[C{{H}_{3}}COOH+C{{O}_{2}}\] | |
| 7318. |
The compound (X) is [IIT-JEE 2005] |
| A. | \[C{{H}_{3}}COOH\] |
| B. | \[BrC{{H}_{2}}-COOH\] |
| C. | \[{{(C{{H}_{3}}CO)}_{2}}O\] |
| D. | \[CHO-COOH\] |
| Answer» D. \[CHO-COOH\] | |
| 7319. |
Which of the following will not give iodoform test? [UPSEAT 2004] |
| A. | Isopropyl alcohol |
| B. | Ethanol |
| C. | Ethanal |
| D. | Benzyl alcohol |
| Answer» E. | |
| 7320. |
The conversion of acetophenone to acetanilide is best accomplished by using : [UPSEAT 2004] |
| A. | Backmann rearrangement |
| B. | Curtius rearrangement |
| C. | Lossen rearrangement |
| D. | Hofmann rearrangement |
| Answer» B. Curtius rearrangement | |
| 7321. |
The most suitable reagent for the conversion of \[RC{{H}_{2}}OH\to RCHO\] is [AIIMS 2004] |
| A. | \[KMn{{O}_{4}}\] |
| B. | \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] |
| C. | \[Cr{{O}_{3}}\] |
| D. | PCC (Pyridine chloro chromate) |
| Answer» E. | |
| 7322. |
Benzophenone does not react with [BHU 2003] |
| A. | \[RN{{H}_{2}}\] |
| B. | \[S{{O}_{3}}\] |
| C. | \[NaOH\] |
| D. | \[N{{a}_{2}}C{{O}_{3}}\] |
| Answer» E. | |
| 7323. |
The key step in cannizzaro?s reaction is the intermolecular shift of [Orissa JEE 2003] |
| A. | Proton |
| B. | Hydride ion |
| C. | Hydronium ion |
| D. | Hydrogen bond |
| Answer» C. Hydronium ion | |
| 7324. |
The most reactive compound towards formation of cyanohydrin on treatment with KCN followed by acidification is [GATE 2001] |
| A. | Benzaldehyde |
| B. | p-Nitrobenzaldehyde |
| C. | Phenyl acetaldehyde |
| D. | p-Hydroxybenzaldehyde |
| Answer» C. Phenyl acetaldehyde | |
| 7325. |
Which of the following will react with water [IIT 1998] |
| A. | \[CHC{{l}_{3}}\] |
| B. | \[C{{l}_{3}}CCHO\] |
| C. | \[CC{{l}_{4}}\] |
| D. | \[ClC{{H}_{2}}C{{H}_{2}}Cl\] |
| Answer» C. \[CC{{l}_{4}}\] | |
| 7326. |
The product(s) obtained via oxymercuration \[(HgS{{O}_{4}}+{{H}_{2}}S{{O}_{4}})\] of 1-butyne would be [IIT-JEE 1999] |
| A. | \[C{{H}_{3}}C{{H}_{2}}COC{{H}_{3}}\] |
| B. | \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}CHO\] |
| C. | \[C{{H}_{3}}C{{H}_{2}}CHO+HCHO\] |
| D. | \[C{{H}_{3}}C{{H}_{2}}COOH+HCOOH\] |
| Answer» B. \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}CHO\] | |
| 7327. |
Which of the following statements regarding chemical properties of acetophenone are wrong (1) It is reduced to methyl phenyl carbinol by sodium and ethanol (2) It is oxidised to benzoic acid with acidified \[KMn{{O}_{4}}\] (3) It does not undergo iodoform electrophilic substitution like nitration at meta position (4) It does not undergo iodoform reaction with iodine and alkali [Tamil Nadu CET 2001] |
| A. | 1 and 2 |
| B. | 2 and 4 |
| C. | 3 and 4 |
| D. | 1 and 3 |
| Answer» D. 1 and 3 | |
| 7328. |
Aldehyde and ketones can decolourize by [CPMT 2003] |
| A. | Bromine water |
| B. | Quick lime |
| C. | dil. \[{{H}_{2}}S{{O}_{4}}\] |
| D. | None of these |
| Answer» E. | |
| 7329. |
The product of acid hydrolysis of P and Q can be distinguished by [IIT-JEE (Screening) 2003] |
| A. | Lucas Reagent |
| B. | 2,4-DNP |
| C. | Fehling's Solution |
| D. | \[NaHS{{O}_{3}}\] |
| Answer» D. \[NaHS{{O}_{3}}\] | |
| 7330. |
Which of the following will give yellow precipitate with \[{{I}_{2}}/NaOH\] [IIT 1997] |
| A. | \[IC{{H}_{2}}COC{{H}_{2}}C{{H}_{3}}\] |
| B. | \[C{{H}_{3}}COOCOC{{H}_{3}}\] |
| C. | \[C{{H}_{3}}CON{{H}_{2}}\] |
| D. | \[C{{H}_{3}}CH(OH)C{{H}_{2}}C{{H}_{3}}\] |
| Answer» B. \[C{{H}_{3}}COOCOC{{H}_{3}}\] | |
| 7331. |
Which of the following will be most readily dehydrated in acidic conditions [IIT-JEE (Screening) 2000] |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» B. | |
| 7332. |
Acetone and acetaldehyde are differentiated by [CPMT 1987, 93] |
| A. | \[NaOH+{{I}_{2}}\] |
| B. | \[Ag(N{{H}_{3}})_{2}^{+}\] |
| C. | \[HN{{O}_{2}}\] |
| D. | \[{{I}_{2}}\] |
| Answer» C. \[HN{{O}_{2}}\] | |
| 7333. |
Which of the following will fail to react with potassium dichromate and dilute sulphuric acid |
| A. | Ethyl alcohol (ethanol) |
| B. | Acetaldehyde (ethanal) |
| C. | Secondary propyl alcohol (2-propanol) |
| D. | Acetone (propanone) |
| Answer» E. | |
| 7334. |
Ethylene reacts with Baeyer's reagent to give [CPMT 1988] |
| A. | Ethane |
| B. | Ethyl alcohol |
| C. | Ethylene glycol |
| D. | None of these |
| Answer» D. None of these | |
| 7335. |
What will be the products of reaction if methoxybenzene reacts with HI |
| A. | Methyl alcohol (methanol) + iodobenzene |
| B. | Methyl iodide (iodomethane) + benzene |
| C. | Methyle iodide + phenol |
| D. | Methyl iodide + iodobenzene |
| Answer» D. Methyl iodide + iodobenzene | |
| 7336. |
The correct order of boiling point for primary \[({{1}^{o}}),\] secondary \[({{2}^{o}})\] and tertiary \[({{3}^{o}})\] alcohols is [CPMT 1999; RPMT 2002] |
| A. | \[{{1}^{o}}>{{2}^{o}}>{{3}^{o}}\] |
| B. | \[{{3}^{o}}>{{2}^{o}}>{{1}^{o}}\] |
| C. | \[{{2}^{o}}>{{1}^{o}}>{{3}^{o}}\] |
| D. | \[{{2}^{o}}>{{3}^{o}}>{{1}^{o}}\] |
| Answer» B. \[{{3}^{o}}>{{2}^{o}}>{{1}^{o}}\] | |
| 7337. |
Phenol \[\xrightarrow{NaN{{O}_{2}}/{{H}_{2}}S{{O}_{4}}}B\xrightarrow{{{H}_{2}}O}C\xrightarrow{NaOH}D\] Name of the above reaction is [KCET 2003] |
| A. | Liebermann?s reaction |
| B. | Phthalein fusion test |
| C. | Reimer-Tiemann reaction |
| D. | Schottenf-Baumann reaction |
| Answer» B. Phthalein fusion test | |
| 7338. |
When alcohol reacts with concentrated \[{{H}_{2}}S{{O}_{4}}\]intermediate compound formed is [AFMC 2005] |
| A. | Carbonium ion |
| B. | Alkoxy ion |
| C. | Alkyl hydrogen sulphate |
| D. | None of these |
| Answer» B. Alkoxy ion | |
| 7339. |
The best reagent to convert pent-3-en-2-ol into pent-3-in-2-one is [AIEEE 2005] |
| A. | Acidic permanganate |
| B. | Acidic dichromate |
| C. | Chromic anhydride in glacial acetic acid |
| D. | Pyridinium chloro-chromate |
| Answer» D. Pyridinium chloro-chromate | |
| 7340. |
Glycerol boils at \[{{290}^{o}}C\] with slight decomposition. Impure glycerin can be purified by [CPMT 1983, 94] |
| A. | Steam distillation |
| B. | Simple distillation |
| C. | Vacuum distillation |
| D. | Extraction with a solvent |
| Answer» D. Extraction with a solvent | |
| 7341. |
Which of the following compounds on boiling with \[KMn{{O}_{4}}\](alk.) and subsequent acidification will not give benzoic acid [KCET 2001] |
| A. | Benzyl alcohol |
| B. | Acetophenone |
| C. | Anisole |
| D. | Toluene |
| Answer» D. Toluene | |
| 7342. |
The reaction of with HBr gives [IIT-JEE 1998] |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» C. | |
| 7343. |
Epoxides are |
| A. | Cyclic ethers |
| B. | Not ethers |
| C. | Aryl-alkyl ethers |
| D. | Ethers with another functional group |
| Answer» B. Not ethers | |
| 7344. |
In the following groups \[\begin{matrix} -OAc \\ \text{I} \\ \end{matrix}\] \[\begin{matrix} -OMe \\ \text{II} \\ \end{matrix}\] \[\begin{matrix} -OS{{O}_{2}}Me \\ \text{III} \\ \end{matrix}\] \[\begin{matrix} -OS{{O}_{2}}C{{F}_{3}} \\ \text{IV} \\ \end{matrix}\] The order of leaving group ability is [IIT 1997] |
| A. | I > II > III > IV |
| B. | IV > III > I > II |
| C. | III > II > I > IV |
| D. | II > III > IV > I |
| Answer» C. III > II > I > IV | |
| 7345. |
When a mixture of ethanol and methanol is heated in the presence of concentrated \[{{H}_{2}}S{{O}_{4}}\] the resulting organic product or products is/are [Manipal MEE 1995] |
| A. | \[C{{H}_{3}}O{{C}_{2}}{{H}_{5}}\] |
| B. | \[C{{H}_{3}}OC{{H}_{3}}\] and \[{{C}_{2}}{{H}_{5}}O{{C}_{2}}{{H}_{5}}\] |
| C. | \[C{{H}_{3}}O{{C}_{2}}{{H}_{5}}\] and \[C{{H}_{3}}OC{{H}_{3}}\] |
| D. | \[C{{H}_{3}}O{{C}_{2}}{{H}_{5}},\] \[C{{H}_{3}}OC{{H}_{3}}\] and \[{{C}_{2}}{{H}_{5}}O{{C}_{2}}{{H}_{5}}\] |
| Answer» E. | |
| 7346. |
Which of the following will be obtained by keeping ether in contact with air for a long time [RPMT 2003] |
| A. | \[{{C}_{2}}{{H}_{5}}-O-CH\ (C{{H}_{3}})-O-OH\] |
| B. | \[{{C}_{2}}{{H}_{5}}-OC{{H}_{2}}-OH\] |
| C. | \[{{C}_{2}}{{H}_{5}}-O-{{C}_{2}}{{H}_{5}}OH\] |
| D. | \[C{{H}_{3}}-O\ CH\ (C{{H}_{3}})-O-OH\] |
| Answer» B. \[{{C}_{2}}{{H}_{5}}-OC{{H}_{2}}-OH\] | |
| 7347. |
The most suitable method of the separation of a 1 : 1 mixture of ortho and para nitrophenols is [CBSE PMT 1994, 99; CPMT 1997] |
| A. | Distillation |
| B. | Sublimation |
| C. | Crystallization |
| D. | Chromatography |
| Answer» B. Sublimation | |
| 7348. |
Oxidation of which of the following by air in presence of vanadium pentoxide gives phenol |
| A. | Toluene |
| B. | Benzene |
| C. | Benzaldehyde |
| D. | Phenyl acetic acid |
| Answer» C. Benzaldehyde | |
| 7349. |
Distinction between primary, secondary and tertiary alcohol is done by [MP PMT/PET 1988; RPMT 2000] |
| A. | Oxidation method |
| B. | Lucas test |
| C. | Victor Meyer method |
| D. | All of these |
| Answer» E. | |
| 7350. |
The product ?A? in the following reaction is \[\begin{array}{*{35}{l}} {{H}_{2}}C\,\,C{{H}_{2}} \\ \begin{align} & \,\,\,\,\,\,\,\,\,\,\,\, \\ & \,\,\,\,\,\,\,\,\,\,\,\,\overset{\backslash /}{\mathop{O}}\, \\ \end{align} \\ \end{array}\xrightarrow{RMgI}A\] [MP PMT 2003] |
| A. | \[RCHOHR\] |
| B. | \[RCHOH\cdot C{{H}_{3}}\] |
| C. | \[R-C{{H}_{2}}-C{{H}_{2}}-OH\] |
| D. | \[\begin{array}{*{35}{l}} R \\ R \\ \end{array}>CHC{{H}_{2}}OH\] |
| Answer» D. \[\begin{array}{*{35}{l}} R \\ R \\ \end{array}>CHC{{H}_{2}}OH\] | |