MCQOPTIONS
Saved Bookmarks
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.
| 851. |
Dipole moment of\[{{H}_{2}}O\] is 1.85 D. If the bond angle is \[~105{}^\circ \] and\[O-H\] bond length is\[~0.94\overset{\text{o}}{\mathop{\text{A}}}\,\], what is the magnitude of charge on the oxygen atom in water molecule? |
| A. | \[2\times {{10}^{-10}}esu\] |
| B. | \[4.28\times {{10}^{-10}}esu\] |
| C. | \[3.22\times {{10}^{-10}}esu\] |
| D. | \[1.602\times {{10}^{-19}}C\] |
| Answer» D. \[1.602\times {{10}^{-19}}C\] | |
| 852. |
Bond distance in HF is \[~9.17\times {{10}^{-11}}m.\] Dipole moment of HF is \[6.104\times {{10}^{-30}}Cm.\] The percentage ionic character in HF will be: (electron charge\[=1.60\times {{10}^{-19}}C\]) |
| A. | 61.0% |
| B. | 0.38 |
| C. | 35.5% |
| D. | 0.415 |
| Answer» E. | |
| 853. |
Which of the following molecular orbitals has two nodal planes? |
| A. | \[\sigma 2s\] |
| B. | \[\pi 2{{p}_{y}}\] |
| C. | \[\pi *2{{p}_{y}}\] |
| D. | \[\sigma *2{{p}_{x}}\] |
| Answer» D. \[\sigma *2{{p}_{x}}\] | |
| 854. |
Which of the following pairs have identical bond order? |
| A. | \[{{N}_{2}},O_{2}^{2+}\] |
| B. | \[{{N}_{2}},O_{2}^{-}\] |
| C. | \[N_{_{2}}^{-},{{O}_{2}}\] |
| D. | \[{{O}^{2+}},{{N}_{2}}\] |
| Answer» B. \[{{N}_{2}},O_{2}^{-}\] | |
| 855. |
Which of the following statements is correct in the context of the allene molecule, \[{{C}_{3}}{{H}_{4}}\]? |
| A. | The central carbon is sp hybridized |
| B. | The terminal carbon atoms are \[s{{p}^{2}}\]hybridized |
| C. | The planes containing the\[C{{H}_{2}}\]groups are mutually perpendicular to permit the formations two separate\[\pi \]bonds |
| D. | All are correct |
| Answer» E. | |
| 856. |
Arrange the following ions in the order of decreasing\[~X-O\] bond length, where X is the central atom |
| A. | \[ClO_{_{4}}^{-},SO_{4}^{2-},PO_{4}^{3-},SiO_{4}^{-}\] |
| B. | \[SiO_{4}^{4-},PO_{4}^{3-},SO_{4}^{2-},ClO_{4}^{-}\] |
| C. | \[SiO_{4}^{4-},PO_{4}^{3-},ClO_{4}^{-},SO_{4}^{2-}\] |
| D. | \[SiO_{4}^{4-},SO_{4}^{2-},PO_{4}^{3-},ClO_{4}^{-}\] |
| Answer» C. \[SiO_{4}^{4-},PO_{4}^{3-},ClO_{4}^{-},SO_{4}^{2-}\] | |
| 857. |
Which of the following is not a correct statement? |
| A. | Ionic compounds are electrically neutral. |
| B. | Boiling point of an ionic compound is more than a covalent compound. |
| C. | Melting point of a covalent compound is more than an ionic compound. |
| D. | Ionic compounds are soluble in polar solvent. |
| Answer» D. Ionic compounds are soluble in polar solvent. | |
| 858. |
Molecular AB has a bond length of \[1.61\overset{\text{o}}{\mathop{\text{A}}}\,\]and a dipole moment of 0.38 D. The fractional charge on each atom (absolute magnitude) is: \[(e=4.802\times {{10}^{-10}}esu)\] |
| A. | 0.5 |
| B. | 0.05 |
| C. | 0 |
| D. | 1 |
| Answer» C. 0 | |
| 859. |
The dipole moments of diatomic molecules AB and CD are 10.41D and 10.27 D, respectively while their bond distances are 2.82 and \[2.67\overset{\text{o}}{\mathop{\text{A}}}\,\], respectively. This indicates that |
| A. | bonding is 100% ionic in both the molecules |
| B. | AB has more ionic bond character than CD |
| C. | AB has lesser ionic bond character than CD |
| D. | bonding is nearly covalent in both the molecules |
| Answer» D. bonding is nearly covalent in both the molecules | |
| 860. |
Which of the following does not apply to metallic bond? |
| A. | Overlapping valence orbitals |
| B. | Mobile valency electrons |
| C. | Delocalized electrons |
| D. | Highly directed bonds. |
| Answer» E. | |
| 861. |
Which of these statements is not true? |
| A. | \[N{{O}^{+}}\] is not isoelectronic with\[{{O}_{2}}\] |
| B. | B is always covalent in its compounds |
| C. | In aqueous solution, the \[T{{l}^{+}}\]ion is much more stable than Tl (III) |
| D. | \[LiAl{{H}_{4}}\] is a versatile reducing agent in organic synthesis. |
| Answer» B. B is always covalent in its compounds | |
| 862. |
Which of the following contains both covalent and ionic bond? |
| A. | \[N{{H}_{4}}Cl\] |
| B. | \[{{H}_{2}}O\] |
| C. | \[CC{{l}_{4}}\] |
| D. | \[CaC{{l}_{2}}\] |
| Answer» B. \[{{H}_{2}}O\] | |
| 863. |
Which of the following amines can be resolved into two enantiomers? |
| A. | I, IV |
| B. | I, II |
| C. | I, III, IV |
| D. | III, IV |
| Answer» E. | |
| 864. |
Reaction of cyclohexanone with dimethylamine in the presence of catalytic amount of an acid forms a compound if water during the reaction is continuously removed. The compound formed is generally known as |
| A. | an amine |
| B. | an imine |
| C. | an enamine |
| D. | a Schiff's base |
| Answer» D. a Schiff's base | |
| 865. |
When aniline reacts with oil of bitter almonds \[({{C}_{6}}{{H}_{5}}CHO)\] condensation takes place and benzal derivative is formed. This is known as |
| A. | Million's base |
| B. | Schiff reagent |
| C. | Schiffs base |
| D. | Benedict's reagent |
| Answer» D. Benedict's reagent | |
| 866. |
The correct stability order of the following resonance structures is\[\underset{(I)}{\mathop{{{H}_{2}}C=\overset{+}{\mathop{N}}\,=\overline{N}}}\,\] \[\underset{(II)}{\mathop{{{H}_{2}}\overset{+}{\mathop{C}}\,-\overset{{}}{\mathop{N}}\,=\overline{N}}}\,\]\[\underset{(III)}{\mathop{{{H}_{2}}\overset{-}{\mathop{C}}\,-\overset{+}{\mathop{N}}\,\equiv N}}\,\] \[\underset{(IV)}{\mathop{{{H}_{2}}\overset{-}{\mathop{C}}\,-\overset{+}{\mathop{N}}\,=\overset{+}{\mathop{N}}\,}}\,\] |
| A. | (I) > (II) > (IV) > (III) |
| B. | (I) > (III) > (II) > (IV) |
| C. | (II) > (I) > (III) > (IV) |
| D. | (III) > (I) > (IV) > (II) |
| Answer» C. (II) > (I) > (III) > (IV) | |
| 867. |
The correct order of decreasing basic character of the three aliphatic primary amines is |
| A. | \[I>II>III\] |
| B. | \[III>II>I\] |
| C. | \[I>II\approx III\] |
| D. | \[I=II\equiv III\] |
| Answer» B. \[III>II>I\] | |
| 868. |
\[{{(C{{H}_{3}})}_{3}}C-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-N{{H}_{2}}\xrightarrow[(ii)\,{{D}_{2}}O]{(i)\,O{{D}^{-}}/B{{r}_{2}}}Product\,P\] is |
| A. | \[{{\left( C{{H}_{3}} \right)}_{3}}CN{{H}_{2}}\] |
| B. | \[{{\left( C{{H}_{3}} \right)}_{3}}CNHD\] |
| C. | \[{{\left( C{{H}_{3}} \right)}_{3}}CN{{D}_{2}}\] |
| D. | no reaction |
| Answer» D. no reaction | |
| 869. |
In Hoftnann bromamide degradation, one of the important steps is the migration of |
| A. | an alkyl group without its electron pair to electron deficient N atom. |
| B. | an alkyl group with its electron pair to electron deficient O atom. |
| C. | an alkyl group with its electron pair to electron rich N atom. |
| D. | an alkyl group with its electron pair to electron deficient N atom. |
| Answer» E. | |
| 870. |
Which of the following leads to carbon-carbon double bond? |
| A. | \[1{}^\circ \] Amine + \[RCHO\to \] |
| B. | \[2{}^\circ \] Amine + \[{{R}_{2}}CO\to \] |
| C. | \[2{}^\circ \] Amine + \[RCHO\to \] |
| D. | Both [b] and [c] |
| Answer» E. | |
| 871. |
Ethylene can be prepared in good yield by |
| A. | \[C{{H}_{3}}C{{H}_{2}}{{N}^{+}}{{(C{{H}_{3}})}_{3}}{{I}^{-}}\xrightarrow{heat}\] \[C{{H}_{2}}=C{{H}_{2}}+{{(C{{H}_{3}})}_{3}}N+HI\] |
| B. | \[C{{H}_{3}}C{{H}_{2}}{{N}^{+}}{{(C{{H}_{3}})}_{3}}O{{H}^{-}}\xrightarrow{heat}\] \[C{{H}_{2}}=C{{H}_{2}}+{{\left( C{{H}_{3}} \right)}_{3}}N+{{H}_{2}}O\] |
| C. | Both [a] and [b] |
| D. | \[C{{H}_{3}}C{{H}_{2}}N{{H}_{2}}\xrightarrow{heat}\] \[{{\operatorname{CH}}_{2}}=C{{H}_{2}}+N{{H}_{3}}\] |
| Answer» C. Both [a] and [b] | |
| 872. |
Pyrrole and pyridine both are basic and form salts with acids? Which of the following statement is true regarding the aromatic character of the four species? |
| A. | All the four are aromatic |
| B. | I, III and IV are aromatic |
| C. | I, II and III are aromatic |
| D. | I and III are aromatic |
| Answer» C. I, II and III are aromatic | |
| 873. |
An organic compound [A] on reduction gives compound [B]. [B] on treatment with \[CHC{{l}_{3}}\] and alcoholic \[KOH\] gives [C]. [C] on catalytic reduction gives N-methylaniline. The compound A is |
| A. | Methylamine |
| B. | Nitromethane |
| C. | Aniline |
| D. | Nitrobenzene |
| Answer» E. | |
| 874. |
In the acidic reduction of nitrobenzene, which of the following is the intermediate? |
| A. | \[{{C}_{6}}{{H}_{5}}-N=O\] |
| B. | \[{{C}_{6}}{{H}_{5}}NH-NH{{C}_{6}}{{H}_{5}}\] |
| C. | \[{{C}_{6}}{{H}_{5}}-N=N-{{C}_{6}}{{H}_{5}}\] |
| D. | \[{{C}_{6}}{{H}_{5}}-N=\overset{O}{\mathop{\overset{\uparrow }{\mathop{N}}\,}}\,-{{C}_{6}}{{H}_{5}}\] |
| Answer» B. \[{{C}_{6}}{{H}_{5}}NH-NH{{C}_{6}}{{H}_{5}}\] | |
| 875. |
Arrange the following three compounds in order of decreasing acidity[A] [B] [C] |
| A. | B>A>C |
| B. | B>C>A |
| C. | C>B>A |
| D. | C>A>B |
| Answer» B. B>C>A | |
| 876. |
Aniline is reacted with bromine water and the resulting product is treated with an aqueous solution of sodium nitrite in presence of dilute\[HCl\]. The compound so formed is converted into tetrafluoroborate which is subsequently heated dry. The final product is |
| A. | p-Bromofluorobenzene |
| B. | p-Bromoaniline |
| C. | 2, 4, 6-Tribromofluorobenzene |
| D. | 1, 3, 5-Tribromobenzene |
| Answer» D. 1, 3, 5-Tribromobenzene | |
| 877. |
In the following reaction, X is \[X\xrightarrow{Bromination}Y\xrightarrow{NaN{{O}_{2}}/HCl}\] \[Z\xrightarrow[{{C}_{2}}{{H}_{5}}OH]{Boiling}Tribromobenzene\] |
| A. | benzoicacid |
| B. | salicylic acid |
| C. | phenol |
| D. | aniline |
| Answer» E. | |
| 878. |
The correct order of basicities of the following compounds is (1)(2)\[C{{H}_{3}}-C{{H}_{2}}-N{{H}_{2}}\](3)\[{{(C{{H}_{3}})}_{2}}NH\](4)\[C{{H}_{3}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-N{{H}_{2}}\] |
| A. | 2>1>3>4 |
| B. | 1>3>2>4 |
| C. | 3>1>2>4 |
| D. | 1>2>3>4 |
| Answer» C. 3>1>2>4 | |
| 879. |
Match the compounds in List I with their nature from List II, as seen in aqueous mediumList IList III. AcetamideA. AcidicII. BenzonitrileB. BasicIII. TriethylamineC. NeutralIV. Phenol |
| A. | I-C; II-C; III-B; IV-A |
| B. | I-B; II-C; III-C; IV-A |
| C. | I-C; II-B; III-B; IV-C |
| D. | I-A; II-A; III-C; IV-B |
| Answer» B. I-B; II-C; III-C; IV-A | |
| 880. |
Primary nitro compounds react with nitrous acid to form nitrolic acids which dissolve in \[NaOH\]giving |
| A. | yellow solution |
| B. | blue solution |
| C. | colourless solution |
| D. | red solution |
| Answer» E. | |
| 881. |
Ethyl isocyanide on hydrolysis in acidic medium generates |
| A. | propanoic acid and ammonium salt |
| B. | ethanoic acid and ammonium salt |
| C. | methylamine salt and ethanoic acid |
| D. | ethylamine salt and methanoic acid |
| Answer» E. | |
| 882. |
An organic compound "A" having molecular formula \[{{C}_{2}}{{H}_{3}}N\] on reduction gave another compound 'B' Upon treatment with nitrous acid, 'B' gave ethyl alcohol. On warming with chloroform and alcoholic KOH, B formed an offensive smelling compound 'C'. The compound 'C' is |
| A. | \[C{{H}_{3}}C{{H}_{2}}N{{H}_{2}}\] |
| B. | \[C{{H}_{3}}C{{H}_{2}}N\vec{=}C\] |
| C. | \[C{{H}_{3}}C\equiv N\] |
| D. | \[C{{H}_{2}}C{{H}_{2}}OH\] |
| Answer» C. \[C{{H}_{3}}C\equiv N\] | |
| 883. |
Acetaldoxime reacts with \[{{P}_{2}}{{O}_{5}}\] to give |
| A. | Methyl cyanide |
| B. | Methyl cyanate |
| C. | Ethyl cyanide |
| D. | None of these |
| Answer» B. Methyl cyanate | |
| 884. |
Which of the following will produce isopropyl amine-(I) \[{{(C{{H}_{3}})}_{2}}CO\xrightarrow{N{{H}_{2}}OH}X\xrightarrow{LiAl{{H}_{4}}}\](II) \[C{{H}_{3}}-C{{H}_{2}}-CHO\xrightarrow[heat]{N{{H}_{3}}}X\xrightarrow{LiAl{{H}_{4}}}\](III) \[{{(C{{H}_{3}})}_{2}}CH-OH+PC{{l}_{5}}\xrightarrow{{}}X\xrightarrow{N{{H}_{3}}}\](IV) \[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}+N{{H}_{2}}\xrightarrow{heat}\] |
| A. | I, II |
| B. | II, III |
| C. | I, III |
| D. | IV only |
| Answer» D. IV only | |
| 885. |
Nitrosoamines \[({{R}_{2}}N-N=O)\] are insoluble in water. On heating with conc. \[{{H}_{2}}S{{O}_{4}}\], they give secondary amines. The reaction is called |
| A. | Liebermann nitroso reaction |
| B. | Etard reaction |
| C. | Fries reaction |
| D. | Perkin reaction |
| Answer» B. Etard reaction | |
| 886. |
Conversion of benzene diazonium chloride to chlorobenzene is an example of which of the following reactions? |
| A. | Claisen |
| B. | Friedel-craft |
| C. | Sandmeyer |
| D. | Wurtz |
| Answer» D. Wurtz | |
| 887. |
Complete reduction of benzene-diazonium chloride with \[Zn/HCl\] gives: |
| A. | Aniline |
| B. | Phenylhydrazine |
| C. | Azobenzene |
| D. | Hydrazobenzene |
| Answer» B. Phenylhydrazine | |
| 888. |
Identify Z in the following sequence of reactions- \[C{{H}_{3}}COON{{H}_{4}}\xrightarrow{\Delta }X\xrightarrow{{{P}_{2}}{{O}_{5}}}Y\] \[\xrightarrow{{{H}_{2}}O/H}Z\] |
| A. | \[C{{H}_{3}}-C{{H}_{2}}-CO-N{{H}_{2}}\] |
| B. | \[C{{H}_{3}}-CN\] |
| C. | \[{{(C{{H}_{3}}CO)}_{2}}O\] |
| D. | \[C{{H}_{3}}-COOH\] |
| Answer» E. | |
| 889. |
The order of basicity of the compounds |
| A. | IV>I>III>II |
| B. | I>III>II>IV |
| C. | III>I>IV>II |
| D. | II>I>III>IV |
| Answer» C. III>I>IV>II | |
| 890. |
Which one of the following is not an oxidation product of a primary amine? |
| A. | A hydroxylamine |
| B. | A nitroso compound |
| C. | A nitro compound |
| D. | All of these |
| Answer» E. | |
| 891. |
Which statement is true regarding the following structure? |
| A. | it is a chiral molecule |
| B. | It exists in two resolvable optically active forms |
| C. | Both [a] and [b] |
| D. | Neither [a] nor [b] |
| Answer» B. It exists in two resolvable optically active forms | |
| 892. |
Predict about the relative boiling point of the following two amines. |
| A. | Boiling point of I > II |
| B. | Boiling point of II > I |
| C. | Both should have equal boiling points |
| D. | It can't be predicted |
| Answer» C. Both should have equal boiling points | |
| 893. |
A compound 'A' when treated with \[HN{{O}_{3}}\] (in presence of \[{{H}_{2}}S{{O}_{4}}\]) gives compound 'B' which is then reduced with Sn and \[HCl\] to aniline? The compound 'A' is |
| A. | toluene |
| B. | benzene |
| C. | ethane |
| D. | acetamide |
| Answer» C. ethane | |
| 894. |
In the diazotisation of arylamines with sodium nitrite and hydrochloric acid, an excess of hydrochloric acid is used primarily to |
| A. | supress the concentration of free aniline available for coupling |
| B. | supress hydrolysis of phenol |
| C. | ensure a stoichiometric amount of nitrous acid |
| D. | neutralise the base liberated |
| Answer» B. supress hydrolysis of phenol | |
| 895. |
Which reaction sequence would be best to prepare 3-chloroanilne from benzene? |
| A. | Chlorination, nitration, reduction |
| B. | Nitration, chlorination, reduction |
| C. | Nitration, reduction, chlorination |
| D. | Nitration, reduction, acetylation, chlorination, hydrolysis |
| Answer» C. Nitration, reduction, chlorination | |
| 896. |
Acetanilide on nitration followed by alkaline hydrolysis mainly gives |
| A. | o-Nitroacetanilide |
| B. | p-Nitroamlme |
| C. | m-Nitroaniline |
| D. | 2, 4, 6-Trinitroamline |
| Answer» C. m-Nitroaniline | |
| 897. |
The most basic compound among the following is |
| A. | Acetanilide |
| B. | Benzylamine |
| C. | p-Nitro aniline |
| D. | Aniline |
| Answer» C. p-Nitro aniline | |
| 898. |
Carbylamine forms from aliphatic or aromatic primary amine via which of the following intermediates? |
| A. | Carbanion |
| B. | Carbene |
| C. | Carbocation |
| D. | Carbon radical |
| Answer» C. Carbocation | |
| 899. |
The final product formed when Methyl amine is treated with \[NaN{{O}_{2}}\] and \[HCl\] is: |
| A. | Diazomethane |
| B. | Methylalcohol |
| C. | Methylcyanide |
| D. | Nitromethane |
| Answer» C. Methylcyanide | |
| 900. |
In the reaction \[{{C}_{6}}{{H}_{5}}N{{H}_{2}}+C{{S}_{2}}\xrightarrow[\Delta ]{HgC{{l}_{2}}}\] the product obtained is |
| A. | phenyl isocyanide |
| B. | phenyl cyanide |
| C. | p-Simmo benzene sulphonic acid |
| D. | phenyl isothiocyanate |
| Answer» E. | |