MCQOPTIONS
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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.
| 3901. |
Two hexoses form the same osazone, find the correct statement about these hexoses. |
| A. | Both of them must be aldoses |
| B. | They are epimers at C-3 |
| C. | The carbon atoms 1 and 2 in both have the same configuration |
| D. | The carbon atoms 3, 4 and 5 in both have the same configuration |
| Answer» E. | |
| 3902. |
Acetone may be obtained from starch by the action of |
| A. | acid |
| B. | bacteria |
| C. | oxidizing agent |
| D. | none of these |
| Answer» C. oxidizing agent | |
| 3903. |
Identify the correct set of stereochemical relationships amongst the following monosaccharides I-IV I. II III. IV. |
| A. | I and II are anomers; III and IV are epimers |
| B. | I and II are epimers; II and IV are anomers |
| C. | I and III are anomers; I and II are epimers |
| D. | I and II are epimers; III and IV are anomers |
| Answer» D. I and II are epimers; III and IV are anomers | |
| 3904. |
Which of the following indicates the presence of 5 -OH groups in glucose? |
| A. | Penta-acetyl derivative of glucose |
| B. | Cyanohydrin formation of glucose |
| C. | Reaction with Fehling's solution |
| D. | Reaction with Tollens reagent |
| Answer» B. Cyanohydrin formation of glucose | |
| 3905. |
The correct statement about the following disaccharide is |
| A. | Ring (I) is pyranose with \[\alpha \]-glycosidic link |
| B. | Ring (I) is furanose with \[\alpha \]-glycosidic link |
| C. | Ring (II) is furanose with \[\alpha \]-glycosidic link |
| D. | Ring (II) is pyranose with \[\beta \]-glycosidic link |
| Answer» B. Ring (I) is furanose with \[\alpha \]-glycosidic link | |
| 3906. |
Select the correct statement about the following disaccharide? |
| A. | Ring A is an acetal in the\[\beta \]-configuration; ring B is a hemiacetal in the \[\alpha \]-configuration |
| B. | Ring A is an acetal in the \[\alpha \]-configuration; ring B is a hemiacetal in the \[\beta \]-configuration |
| C. | Ring A is a hemiacetal in the \[\alpha \]-configuration; ring B is an acetal in the \[\beta \]-configuration |
| D. | Ring A is a hemiacetal in the \[\beta \]-configuration; ring B is an acetal in the \[\alpha \]-configuration. |
| Answer» C. Ring A is a hemiacetal in the \[\alpha \]-configuration; ring B is an acetal in the \[\beta \]-configuration | |
| 3907. |
Identity X, Y and Z from the information given below: X = A chiral amino acid which loses its chirality on treatment with lithium aluminum hydride. Y= the decarboxylation product of a-amino (secondary) acid, \[{{C}_{5}}{{H}_{9}}{{O}_{2}}N\]. Z = It is formed when A (\[{{C}_{3}}{{H}_{4}}{{O}_{3}}\]) is treated with (i) \[N{{H}_{3}}\](ii) \[NaB{{H}_{4}}\] [A forms oxime, gives iodoform test and liberate \[C{{O}_{2}}\] with \[NaHC{{O}_{3}}\]]. |
| A. | X YZ Alanine Serine |
| B. | X YZ Serine Alanine |
| C. | X YZ Serine Alanine |
| D. | X YZ Aspartic acid Serine |
| Answer» D. X YZ Aspartic acid Serine | |
| 3908. |
Peptides are formed by the joining of amino acids through amide linkage. Which of the following statement is not true in this respect? |
| A. | Amide groups do not contribute in the hydrogen bonding interactions |
| B. | \[p\pi \] resonance stabilizes the amide linkages |
| C. | Amide groups are more resistant to hydrolysis than the similar ester groups |
| D. | Stable conformations of peptides are restricted to those having planar amide groups |
| Answer» B. \[p\pi \] resonance stabilizes the amide linkages | |
| 3909. |
X controls the process of burning of fats, proteins and carbohydrates and liberate energy in the body X is |
| A. | thyroxine |
| B. | adrenaline |
| C. | cortisone |
| D. | insulin |
| Answer» E. | |
| 3910. |
Which of the following pairs give positive Tollen's test? |
| A. | Glucose, sucrose |
| B. | Glucose, fructose |
| C. | Hexanal, acetophenone |
| D. | Fructose, sucrose |
| Answer» C. Hexanal, acetophenone | |
| 3911. |
In a multielectron atom, which of the following orbitals described by the three quantum numbers will have the same energy in the absence of magnetic field(i) n = l,\[l\]= 0, m=0 (ii) n = 2,\[l\]= 0, m =0 (iii) n = 2,\[l\]= l ,m = l (iv) n = 3,\[l\]= 2, m = l (v) n = 3,\[l\]= 2, m = 0 |
| A. | (i) and (ii) |
| B. | (ii) and (iii) |
| C. | (iii) and (iv) |
| D. | (iv) and (v) |
| Answer» E. | |
| 3912. |
In Bohr series of lines of hydrogen spectrum, third line from the red end corresponds to which one of the following inner orbit jumps of electron for Bohr's orbit in atom of hydrogen |
| A. | 4 \[\to \] 1 |
| B. | 2 \[\to \] 5 |
| C. | 3 \[\to \] 2 |
| D. | 5 \[\to \] 2 |
| Answer» E. | |
| 3913. |
Identify the incorrect statements |
| A. | An electronic wave function must be symmetrical with respect to the interchange of any two electrons |
| B. | \[{{\psi }^{2}}\]must remain unchanged when the spin and space coordinates of the paired electrons are interchanged |
| C. | For an n electron system the wave function \[\psi \] will be a function of 3 n spatial coordinate |
| D. | Antisymmetrical wave function are found to represent the properties of electron. |
| Answer» B. \[{{\psi }^{2}}\]must remain unchanged when the spin and space coordinates of the paired electrons are interchanged | |
| 3914. |
Uncertainty in position of a minute particle of mass 25 g in space is \[{{10}^{-5}}^{{}}\] m. The uncertainty in its velocity (in m/s) is |
| A. | \[2.1\times {{10}^{-34}}\] |
| B. | \[0.5\times {{10}^{-34}}\] |
| C. | \[2.1\times {{10}^{-28}}\] |
| D. | \[0.5\times {{10}^{-23}}\] |
| Answer» D. \[0.5\times {{10}^{-23}}\] | |
| 3915. |
Which transition in \[L{{i}^{{{2}^{+}}}}\] would have the same wavelength as the \[2\text{ }\to \text{ }4\] transition in \[H{{e}^{+}}\] ion? |
| A. | 4 \[\to \] 2 |
| B. | 2 \[\to \] 4 |
| C. | 3 \[\to \] 6 |
| D. | 6 \[\to \] 2 |
| Answer» D. 6 \[\to \] 2 | |
| 3916. |
A photon of frequency n causes photoelectric emission from a surface with threshold frequency \[{{n}_{0}}\].The de Broglie wavelength\[\lambda \]of the photoelectron emitted is given as |
| A. | \[\Delta n=\frac{h}{2m\lambda }\] |
| B. | \[\Delta n=\frac{h}{\lambda }\] |
| C. | \[\left[ \frac{1}{{{v}_{0}}}-\frac{1}{v} \right]=\frac{m{{c}^{2}}}{h}\] |
| D. | \[\lambda =\sqrt{\frac{h}{2m\Delta n}}\] |
| Answer» E. | |
| 3917. |
A certain metal when irradiated to light (v = 3.2 \[\times {{10}^{16}}\]Hz) emits photoelectrons with twice kinetic energy as did photoelectrons when the same metal is irradiated by ligh1 (v = 2.0 \[\times {{10}^{16}}\] Hz) The \[{{v}_{0}}\] (threshold frequency) of metal is |
| A. | \[1.2\times {{10}^{14}}Hz\] |
| B. | \[8\times {{10}^{15}}Hz\] |
| C. | \[1.2\times {{10}^{16}}Hz\] |
| D. | \[4\times {{10}^{12}}Hz\] |
| Answer» C. \[1.2\times {{10}^{16}}Hz\] | |
| 3918. |
Which of the following statements about quantum numbers is wrong: |
| A. | If the value of\[l=0\], the electron distribution is spherical |
| B. | The shape of the orbital is given by subsidiary quantuir number. |
| C. | The Zeeman's effect is explained by magnetic quanturr number. |
| D. | The spin quantum number gives the orientations of electron cloud. |
| Answer» E. | |
| 3919. |
The wave number of the first line of Balmer series of hydrogen is 15200\[c{{m}^{-1}}\]. The wave number of the corresponding line of \[L{{i}^{{{2}^{+}}}}\]ion is |
| A. | \[15200\,c{{m}^{-1}}\] |
| B. | \[60800\,c{{m}^{-1}}\] |
| C. | \[76000\,c{{m}^{-1}}\] |
| D. | \[136800\,c{{m}^{-1}}\] |
| Answer» E. | |
| 3920. |
The energy of electron in first Bohr's orbit of H-atom is -13.6 eV. What will be its potential energy in n = \[{{4}^{th}}\] orbit |
| A. | -13.6eV |
| B. | -3.4eV |
| C. | -0.85eV |
| D. | -1.70eV |
| Answer» E. | |
| 3921. |
The energy required to break 1 mol of \[Cl-Cl\] bonds in \[C{{l}_{2}}\] is 242 kJ/mol. The longest wavelength of light capable of breaking a single \[Cl-Cl\] bond is |
| A. | 594 nm |
| B. | 640 nm |
| C. | 700 nm |
| D. | 494 nm |
| Answer» E. | |
| 3922. |
1In an atom, an electron is moving with a speed of 600 m/s with an accuracy of 0.005 %. Certainty with which the position of the electron can be located is (h = 6.6 x \[{{10}^{-34}}\] kg \[{{m}^{2}}\]/s, mass of electron, \[{{e}_{m}}\] = 9.1 x \[{{10}^{31}}\] kg) |
| A. | \[1.52\times {{10}^{-4}}m\] |
| B. | \[5.10\times {{10}^{-3}}m\] |
| C. | \[1.92\times {{10}^{-3}}m\] |
| D. | \[3.84\times {{10}^{-3}}m\] |
| Answer» D. \[3.84\times {{10}^{-3}}m\] | |
| 3923. |
Wavelength of radio waves is |
| A. | < microwaves |
| B. | > microwaves |
| C. | \[\le \]infrared waves |
| D. | \[\le \]UV rays |
| Answer» C. \[\le \]infrared waves | |
| 3924. |
Acetaldehyde on warming with Fehling solution gives a red precipitate of |
| A. | Elemental copper |
| B. | Cuprous oxide |
| C. | Cupric oxide |
| D. | Mixture of all of the above |
| Answer» C. Cupric oxide | |
| 3925. |
Consider the following reaction sequence: Final major product X. The correct statement regarding X is |
| A. | It has an aldehyde functional group |
| B. | it has both aldehyde and Ketone functional groups |
| C. | it has a ketone functional group |
| D. | it has a ketone and an acid functional group |
| Answer» C. it has a ketone functional group | |
| 3926. |
The compound that will not give iodoform on treatment with alkali and iodine is |
| A. | acetone |
| B. | ethanol |
| C. | diethyl ketone |
| D. | isopropyl alcohol |
| Answer» D. isopropyl alcohol | |
| 3927. |
Silver mirror test is given by which one of the following compounds? |
| A. | Acetaldehyde |
| B. | Acetone |
| C. | Diethyl ether |
| D. | Benzophenone |
| Answer» B. Acetone | |
| 3928. |
Trichloroacetaldehyde was subjected to cannizaro's reaction by using NaOH. The mixture of the products contains sodium trichloroacetate ion and another compound. The other compound is |
| A. | 2, 2, 2-trichlorethanol |
| B. | trichloromethanol |
| C. | 2, 2, 2-trichloroethanol |
| D. | chloroform |
| Answer» B. trichloromethanol | |
| 3929. |
The best reagent to convert pent-3-en-2-ol into pent-3-en-2-one is |
| A. | acidic \[KMn{{O}_{4}}\] |
| B. | alkaline \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] |
| C. | chromic anhydride in glacial acetic acid |
| D. | pyridinium chloro chromate |
| Answer» E. | |
| 3930. |
On mixing ethy1 acetate with aqueous sodium chloride, the composition of the resultant solution is |
| A. | \[C{{H}_{3}}Cl+{{C}_{2}}{{H}_{5}}COONa\] |
| B. | \[C{{H}_{3}}COONa+{{C}_{2}}{{H}_{5}}OH\] |
| C. | \[C{{H}_{3}}COCl+{{C}_{2}}{{H}_{5}}OH+NaOH\] |
| D. | \[C{{H}_{3}}COO{{C}_{2}}{{H}_{5}}+NaCl\] |
| Answer» E. | |
| 3931. |
Consider the following reaction: The correct statement regarding the above reaction is |
| A. | Reaction involves a rearrangement via a bicycle intermediate |
| B. | It is a simple oxidation reaction |
| C. | It is a condensation reaction |
| D. | All of the above |
| Answer» B. It is a simple oxidation reaction | |
| 3932. |
In the reaction, \[{{(C{{H}_{3}})}_{3}}CCHO+HCHO\xrightarrow[heat]{NaOH}A+B\] The products (1) and (2) are respectively: |
| A. | \[{{(C{{H}_{3}})}_{3}}CCOONa\] and \[C{{H}_{3}}OH\] |
| B. | \[{{(C{{H}_{3}})}_{3}}CC{{H}_{2}}OH\] and \[C{{H}_{3}}OH\] |
| C. | \[{{(C{{H}_{3}})}_{3}}COONa\] and \[HCOO{{N}^{-}}N{{a}^{+}}\] |
| D. | \[{{(C{{H}_{3}})}_{3}}CC{{H}_{2}}OH\]and \[HCO{{O}^{-}}N{{a}^{+}}\] |
| Answer» E. | |
| 3933. |
Which is the most suitable reagent for the following transformation? |
| A. | \[Zn(Hg)-HCl\] |
| B. | \[LiAi{{H}_{4}}\] |
| C. | \[{{N}_{2}}{{H}_{4}}/NaOH/Heat\] |
| D. | \[NaB{{H}_{4}}\] |
| Answer» D. \[NaB{{H}_{4}}\] | |
| 3934. |
\[{{C}_{2}}{{H}_{2}}\xrightarrow[Dil.{{H}_{2}}S{{O}_{4}}]{HgS{{O}_{4}}}P\xrightarrow{(0)}\] \[Q\xrightarrow[Pyridine]{SOC{{l}_{2}}}R\xrightarrow{{{({{C}_{2}}{{H}_{5}})}_{2}}Cd}S\] The end product in the above sequence of reactions is |
| A. | Ethylethanal |
| B. | 2-Butanone |
| C. | Propanal |
| D. | Propanone |
| Answer» C. Propanal | |
| 3935. |
The correct order of acidic strength of the following alcohols is I. \[C{{H}_{3}}OH\] II. \[{{C}_{2}}{{H}_{5}}OH\] III. \[C{{H}_{3}}-CH(OH)-C{{H}_{3}}\] IV. |
| A. | I<II<III<IV |
| B. | III<II<IV<I |
| C. | III<IV<I<III |
| D. | IV<III<II<I |
| Answer» E. | |
| 3936. |
In the above reaction the major product is shown which is formed through the intermediate (carbocation) given below: Which bond will migrate to form the above product? |
| A. | q |
| B. | p |
| C. | r |
| D. | s |
| Answer» B. p | |
| 3937. |
n-Propyl alcohol and isopropyl alcohol can be chemically distinguished by which reagent |
| A. | \[PC{{l}_{5}}\] |
| B. | reduction |
| C. | oxidation with potassium dichromate |
| D. | ozonolysis |
| Answer» D. ozonolysis | |
| 3938. |
In the reaction given below, \[cis\text{-}3\text{-}Hexene+C{{F}_{3}}C{{O}_{3}}H\to X\xrightarrow[{{H}_{2}}O]{{{H}_{2}}S{{O}_{4}}}Y\] The correct deduction concerning X and Y is |
| A. | Both X and Y are meso isomers |
| B. | X is racemic mixture while Y is meso |
| C. | X is meso isomer while Vis racemic mixture |
| D. | Both X and Fare racemic mixture |
| Answer» D. Both X and Fare racemic mixture | |
| 3939. |
What is the increasing order of solubility of the following in water? |
| A. | I<II<III<IV |
| B. | IV<III<II<I |
| C. | I<III<II<IV |
| D. | IV<II<III<I |
| Answer» D. IV<II<III<I | |
| 3940. |
The order of reactivity of the following alcohols towards cone. HCl is |
| A. | I>II>III>IV |
| B. | I>III>II>IV |
| C. | IV>III>II>I |
| D. | IV>III>I>II |
| Answer» D. IV>III>I>II | |
| 3941. |
Propene, \[C{{H}_{3}}-CH=C{{H}_{2}}\], can be converted to 1-propanol by oxidation. Which set of reagents among the following is ideal to effect the conversion? |
| A. | Alkaline \[KMn{{O}_{4}}\] |
| B. | \[{{B}_{2}}{{H}_{6}}\] and alkaline \[{{H}_{2}}{{O}_{2}}\] |
| C. | \[{{O}_{3}}/Zn\] dust |
| D. | \[Os{{O}_{4}}/NaHS{{O}_{3}}\] |
| Answer» C. \[{{O}_{3}}/Zn\] dust | |
| 3942. |
For the identification of \[\beta \]-naphthol using dye test, it is necessary to use |
| A. | dichloromethane solution of \[\beta \]-naphthol |
| B. | acidic solution of \[\beta \]-naphthol |
| C. | neutral solution of\[\beta \]-naphthol |
| D. | alkaline solution of \[\beta \]-naphthol |
| Answer» E. | |
| 3943. |
Arrange the following alcohols in the increasing order o reactivity with HBr. (I) benzyl alcohol (II) p-methyl benzyl alcohol (III) p-nitrobenzyl alcohol (IV) p-chlorobenzyl alcohol |
| A. | I<II<III<IV |
| B. | III<IV<I<II |
| C. | II<I<IV<III |
| D. | IV<II<II<I |
| Answer» C. II<I<IV<III | |
| 3944. |
Which of the following pairs of compounds can be used as starting material in the synthesis of 2-phenyl-2-pentanol? |
| A. | PhBr and \[{{(C{{H}_{3}})}_{2}}C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}COC{{H}_{3}}\] |
| B. | \[{{(C{{H}_{3}})}_{2}}CHC{{H}_{2}}Br\] and \[PhCOC{{H}_{3}}\] |
| C. | \[C{{H}_{3}}-{{(C{{H}_{2}})}_{2}}-C{{H}_{2}}Br\]and \[{{C}_{6}}{{H}_{5}}COOH\] |
| D. | PhBr and \[{{(C{{H}_{3}})}_{2}}CHC{{H}_{2}}COC{{H}_{3}}\] |
| Answer» B. \[{{(C{{H}_{3}})}_{2}}CHC{{H}_{2}}Br\] and \[PhCOC{{H}_{3}}\] | |
| 3945. |
A solution contains \[1.2046\times {{10}^{24}}\] hydrochloric acid molecules in one \[d{{m}^{3}}\] of the solution. The strength of the solution is [KCET 2004] |
| A. | 6 N |
| B. | 2 N |
| C. | 4 N |
| D. | 8 N |
| Answer» C. 4 N | |
| 3946. |
\[NaClO\] solution reacts with \[{{H}_{2}}S{{O}_{3}}\] as, \[NaClO+{{H}_{2}}S{{O}_{3}}\to NaCl+{{H}_{2}}S{{O}_{4}}\]. A solution of \[NaClO\] used in the above reaction contained 15g of \[NaClO\] per litre. The normality of the solution would be [AMU 1999] |
| A. | 0.8 |
| B. | 0.6 |
| C. | 0.2 |
| D. | 0.33 |
| Answer» E. | |
| 3947. |
What is molarity of a solution of HCl which contains 49% by weight of solute and whose specific gravity is 1.41 [CPMT 2001; CBSE PMT 2001] |
| A. | 15.25 |
| B. | 16.75 |
| C. | 18.92 |
| D. | 20.08 |
| Answer» D. 20.08 | |
| 3948. |
Molarity of a solution containing \[1g\,NaOH\] in \[250ml\] of solution is [EAMCET 1990] |
| A. | \[0.1M\] |
| B. | \[1M\] |
| C. | \[0.01\,M\] |
| D. | \[0.001\,M\] |
| Answer» B. \[1M\] | |
| 3949. |
A 5 molar solution of \[{{H}_{2}}S{{O}_{4}}\] is diluted from 1 litre to 10 litres. What is the normality of the solution [AFMC 2005] |
| A. | 0.25 N |
| B. | 1 N |
| C. | 2 N |
| D. | 7 N |
| Answer» B. 1 N | |
| 3950. |
A solution contains \[25%{{H}_{2}}O\],\[25%{{C}_{2}}{{H}_{5}}OH\] and \[50%\,C{{H}_{3}}\,COOH\] by mass. The mole fraction of \[{{H}_{2}}O\] would be |
| A. | 0.25 |
| B. | 2.5 |
| C. | 0.503 |
| D. | 5.03 |
| Answer» D. 5.03 | |