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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Nitrobenzene on reduction with `LiAIH_(4)` in ether givesA. azobenzeneB. hydrazobenzeneC. anilineD. azoxybenzene |
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Answer» Correct Answer - A See the above reaction |
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| 52. |
Which of the following compounds on hydrolysis by boiling hydrochloric acid form carboxylic acid ?A. `{:(CH_(3)-CHCH_(2)NO_(2)),(" |"),(" "CH_(3)):}`B. `CH_(3)(CH_(2))_(2)CHNO_(2)`C. `(CH_(3))_(3)CNO_(2)`D. none of these. |
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Answer» Correct Answer - A Primary nitrocompounds are hydrolysed by boiling `HCl` to a caroxylic acid and hydroxyl amine. `{:(CH_(3)-CH-CH_(2)NO_(2)+H_(2)O rarr CH_(3)CHCO_(2)H+NH_(2)OH),(" |"" |"),(" "CH_(3)" "CH_(3)),(" "(1^(@))):}` `2^(@)` Nitrocompounds give ketone and `N_(2)O`. `2R_(2)CHNO_(2) overset(HCl)(rarr) 2R_(2)CO+N_(2)O+H_(2)O` |
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| 53. |
Which of the following compounds does not show tautomerism ?A. NitromethaneB. `2-`NitropropaneC. NitroethaneD. Nitrobenzene |
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Answer» Correct Answer - D Nitrobenzene has no `alpha`-hydrogen. |
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| 54. |
Which is the correct sequence to convert `R - CH_(2) OH rarr R[CH_(2)]_(2) NH_(2)`A. `NH_(3), H_(3)O^(+), KCN`B. `PBr_(3), KCN, H_(3)O^(+)`C. `PBr_(3), KCN, H_(2)//Pt`D. `KCN, H_(3)O^(+), H_(2)//Pt` |
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Answer» Correct Answer - C `R-CH_(2)OH overset(PBr_(3))(rarr)RCH_(2)Br overset(alc. KCN)(rarr)RCH_(2)CN overset(H_(2)//Pt)(rarr)RCH_(2)CH_(2)NH_(2)` |
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| 55. |
`RCH_(2) OH underset(K_(2)Cr_(2)O_(7))rarr X underset((ii) "Heat")overset((i) NH_(3))rarr Y overset(H_(2) // Ni)rarr Z` Here, Z isA. `RCH_(2)CH_(2)NH_(2)`B. `RCH_(2)NH_(2)`C. `RCH_(2)CONH_(2)`D. `RNH_(2)` |
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Answer» Correct Answer - B `R-CH_(2)OH overset(K_(2)Cr_(2)O_(7))(rarr) RCOOH underset("(ii) Heat")overset((i) NH_(3))(rarr) RCONH_(2) overset(H_(2), Ni)(rarr) RCH_(2)NH_(2)` |
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| 56. |
Mendius reaction involves the:A. reduction of aldehydes to give alcoholsB. reduction of nitriles with sodium and ethanolC. oxidation of nitrilesD. hydrolysis of cyanides |
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Answer» Correct Answer - B Mendius reaction. The reduction of cyanides to `1^(@)` amines by using ethanolic sodium is called as Mendius reaction. `R-C equiv N+4[H] overset(Na//alc)(rarr) underset(1^(@)" amine")(R-CH_(2)-NH_(2))` |
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| 57. |
Aromatic nitriles `(ArCN)` are not prepared by reaction .A. `ArX+KCN`B. `ArN_(S)^(+)+CuCN`C. `ArCONH_(2)+P_(2)O_(5)`D. `ArCONH_(2)+SOCl_(2)`. |
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Answer» Correct Answer - A ArX is very inert towards nucleophilic substitution reactions. |
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| 58. |
Carcinogens are the products of the reaction betweenA. `R_(2) NH + HNO_(2)`B. `R_(3)N + HNO_(2)`C. `RNH_(2) + HNO_(2)`D. None |
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Answer» Correct Answer - A Nitrosoamines. |
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| 59. |
Which is formed when `(CH_(3))_(4)NOH` is heated ?A. `CH_(3) NH_(2)`B. `C_(2)H_(5)NH_(2)`C. `(CH_(3))_(3) N`D. `(CH_(2))_(3)N` |
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Answer» Correct Answer - C `(CH_(3))_(4)overset(+)(N)Ooverset(-)(H) overset(Delta)(rarr) (CH_(3))_(3)N+CH_(3)OH` |
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| 60. |
When `(CH_(3))_(3)CNH_(3)^(+)Cl^(-)` is heated, product isA. `(CH_(3))_(3)C Cl, NH_(4)Cl`B. `(CH_(3))_(2)C=CH_(2), NH_(4)Cl`C. `(CH_(3))_(3)CNH_(2), HCl`D. None of these. |
| Answer» Correct Answer - B | |
| 61. |
The order of reactivity of the following compounds towards ammonia is `underset((I))(CH_(3)-I)" "underset((II))(CH_(3)-Br)" "underset((III))(CH_(3)-Cl)`A. `I gt II gt III`B. `I lt II lt III`C. `I lt II gt III`D. `I lt III gt II`. |
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Answer» Correct Answer - A Reaction of an alkyl halide with `NH_(3)` is an example of nucleophilic substitution. As the bond strength order is `C-I lt C-Br lt C-Cl`. `R-I` reacts at fastest at faster rate with `NH_(3)` and `R-Cl` at a slower rate. |
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| 62. |
Which of the following reactions will give tetra methyl hydrazine ?A. `NH_(2)-NH_(2)+CH_(2)Cl_(2)`B. `NH_(2)overset(+)(N)H_(3)Cl+CH_(4)`C. `(CH_(3))_(2)NH+H_(2)S_(2)O_(5)`D. `(CH_(3))_(2)NH+KMnO_(4)`. |
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Answer» Correct Answer - D `2(CH_(3))_(2)NH underset(KMnO_(4))overset([O])(rarr) (CH_(3))_(2) underset("Tetramethylhydrazine")(N-N(CH_(3))_(2))+H_(2)O` |
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| 63. |
The value of `K_(b)` is highest is case ofA. `p-`MethoxyanilineB. `p-`ChloroanilineC. `p-`NitroanilineD. `p-`Methylaniline |
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Answer» Correct Answer - A Because it is strongest base out of these. |
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| 64. |
Which of the following will have lowest value of `pK_(b)`?A. `CH_(3)NH_(2)`B. `(CH_(3))_(2) NH`C. `NH_(3)`D. `C_(6)H_(5)NH_(2)` |
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Answer» Correct Answer - B `(CH_(3))_(2)NH`, stronger the base, lowest is the `pK_(b)` value. |
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| 65. |
Which has highest `pk_(a)` valueA. `R_(3)C-NH_(2)`B. `R_(2)NH`C. `R-NH_(2)`D. `NH_(3)`. |
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Answer» Correct Answer - D Only `2^(@)` and `3^(@)` amines do not liberate `N_(2)` on reaction with `HNO_(2)`. All the given amines are `1^(@)` except tri-methylamine which is `3^(@)`. Thus, option (A) is correct. |
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| 66. |
Which of the following can produce hydrogen when treated with metallic sodium ?A. `CH_(3)NH_(2)`B. `CH_(3)CONH_(2)`C. `(CH_(3))_(2)NH`D. `C_(6)H_(5)NH_(2)` |
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Answer» Correct Answer - B `H_(3)C-overset(O)overset("||")(C)-NH_(2)+Na rarr H_(3)C-overset(O)overset("||")(C)-NH^(-)Na^(+)+1//2H_(2) uarr` |
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| 67. |
The base with lowest `pK_(a)` value isA. `N equiv C CH_(2)NH_(2)`B. `Et_(3)N`C. `NH_(3)`D. `HO-CH_(2)CH_(2)NH_(2)`. |
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Answer» Correct Answer - A As the basicity decreases `pKa` value decreases. Due to the presence of strong electron with drawing group (-I effect) (A) is the weakest base. The `N equiv C-CH_(2)NH_(2)` has the lowest electron density on N atom and is the weakest base. `:. N equiv C-CH_(2)NH_(2)` has lowest `pK_(a)` value. |
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| 68. |
Which of the following is the weakest base ?A. `CH_(3) CH_(2) overset(..)(N)H_(2)`B. `(CH_(3))_(2) overset(..)(N)H`C. `CH_(3) CH_(2) underset(..)overset(..)(O)H`D. `overset(..)(N)H_(3)` |
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Answer» Correct Answer - C `H_(3)C-CH_(2)-overset(..)(O)-H`. It is acidic in nature. |
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| 69. |
Which of the following amines is optically active ?A. `CH_(3)NH_(2)`B. `CH_(3)NHCH_(3)`C. `CH_(3)CH_(2) CH_(2) - overset(CH_(3))overset(|)(N) - C_(2) H_(5)`D. sec-Butylamine |
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Answer» Correct Answer - D `{:(" "NH_(2)),(" |"),(CH_(3)CHC_(2)H_(5)):}` (sec. butyl amine) has a chiral structure. |
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| 70. |
Nitrogethane is acidic only towardsA. `Na_(2)CO_(3)`B. `NaOH`C. `C_(2)H_(5)OH`D. Liquid `NH_(3)` |
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Answer» Correct Answer - B Properties of `1^(@)` and `2^(@)` nitroalkanes. |
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| 71. |
Which of the following is carcinogenic ?A. AnilineB. N-nitrosoamineC. EthylamineD. all the three |
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Answer» Correct Answer - B Nitrosoamines are carcinogenic (cancer causing). |
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| 72. |
The colour of `p-`aminoazobenzene isA. OrangeB. Congo redC. Bismark brownD. Indigo |
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Answer» Correct Answer - A See coupling reaction of diazonium salts. |
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| 73. |
How many structural isomers are possible from molecular formula `C_(3)H_(9)N`A. oneB. twoC. threeD. four. |
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Answer» Correct Answer - D Four isomers of `C_(3)H_(9)N` are (i) `underset("1-Aminopropane")(CH_(3)CH_(2)CH_(2)NH_(3))` (ii) `underset(2^(@)-"Aminopropan")(CH_(3)-overset(CH_(3))overset(|)(CH)-NH_(2))` (iii) `underset ("N-Methylaminoethane")(CH_(3)CH_(2)-overset(H)overset(|)(N)-CH_(3))` (iv) `underset("N, N-Dimethylaminomethane")(CH_(3)-overset(CH_(3))overset(|)(N)-CH_(3))` |
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| 74. |
Which of the following nitro compound will show tautomerism ?A. `C_(6)H_(5)NO_(2)`B. `(CH_(3))_(3)CNO_(2)`C. `CH_(2)CH_(2)-NO_(2)`D. o-Nitrotoluene |
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Answer» Correct Answer - C `{:(H_(3)C-CH_(2)-N=O hArr H_(3)C-CH=N-OH),(" "darr" "darr),(" "O" "O):}` |
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| 75. |
Which combination will give methyl isocyanate ?A. `CH_(3)Cl+O`B. `CH_(3)NH_(2)+CH_(2)Cl_(2)`C. `CH_(3)NH_(2)+COCl_(2)`D. `C_(2)H_(5)OH+COCl`. |
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Answer» Correct Answer - C `CH_(3)NH_(2)+COCl_(2) rarr underset("isocyanate")underset("Methyl")(CH_(3)-N)=C=O+2HCl` |
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| 76. |
Which of the following will not give dinitrogen gas with nitrous acid ?A. PropanamineB. EthanamineC. TrimethylamineD. Isopropylamine. |
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Answer» Correct Answer - C Only primary amines `-NH_(2)` (other than methamine) give `N_(2)` with `HNO_(2)`. |
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| 77. |
Which of the following does not represent functional isomers of each other ?A. `CH_(3)CH_(2)NO_(2) " and " CH_(3)CH_(2) O - N`B. `C_(6)H_(5)CHO " and " CH_(3)COCH_(3)`C. `CH_(3)CH_(2) CH_(2)NH_(2) " and " (CH_(3))_(3)N`D. |
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Answer» Correct Answer - C `CH_(3)CH_(2)CH_(2)NH_(2)` and `(CH_(3))_(2)CHNH_(2)` are chain isomers and not functional isomers. |
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| 78. |
`C_(3)H_(9)N` cannot representA. `1^(@)` amineB. `2^(@)` AminesC. `3^(@)` amineD. quaternary salt. |
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Answer» Correct Answer - D Factual question. |
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| 79. |
Which of the following is least alkaline ?D. All are equall basic |
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Answer» Correct Answer - A See Basicity of substituted anilines. |
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| 80. |
`C_(6)H_(5)C-=N` and `C_(6)H_(5)N-=C` exhibit which type of isomerismA. PositionB. functionalC. enantimerismD. functional as well as tautomerism |
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Answer» Correct Answer - B See topic on isomerism in Unit 5.2. |
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| 81. |
Among following statements on the nitration of aromatic compounds, the false one isA. the rate of nitration of benzene is almost the same as that of hexadeuterobenzeneB. therate of nitration of toluene is greater than that of benzeneC. the rate of nitration of benzene is greater than that of hexadeuterobenzeneD. nitration is an electrophilic substitution reaction. |
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Answer» Correct Answer - C Rate determining step in the electrophilic substitution of benzene is the attack of electrophile on benzene ring and not the breaking of `C - H` bond in benzene. |
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| 82. |
Acetone is treated with hydroxylamine and the derivative so formed is subjected to catalytic hydrogenation. Final product isA. IsopropylamineB. MethanamineC. TrimethylamineD. Propylamine |
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Answer» Correct Answer - A `{:(" "CH_(3)" "CH_(3)" "CH_(3)),(" | | |"),(CH_(3)-C=O+H_(2)NOH rarr CH_(3)-C=NOH overset("Reduction")(rarr)CH_(3)-CHNH_(2)+H_(2)O),(" Oxime"" Isopropylamine"):}` |
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| 83. |
Vapour phase nitration of propane followsA. electrophilic substitution mechanismB. free radical substitution mechanismC. nucleophilic substitution mechanismD. electrophilic addition mechanism. |
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Answer» Correct Answer - B `HO-NO_(2) overset(400^(@)C)(rarr) Hoverset(*)(O)+overset(*)(N)O_(2)` ltbr. `R-H+ overset(*)(N)O_(2) overset(overset(*)(O)H)(rarr) RNO_(2)+H_(2)O` |
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| 84. |
When nitrobenzene is treated with `Br_(2)` in presence of `FeBr_(3)`, the major product formed is `m-`bromo`-`nitrobenzene. Statement which is related to obtain the `m-`isomer isA. the intermediate carbocation formed after initial attack of `Br^(+)` at the meta-position is least stabilisedB. the electron density on meta carbon is more than that on ortho and para-positionsC. loss of aromaticity when `Br^(+)` attacks at the ortho and para positions and not at meta positionD. None of these. |
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Answer» Correct Answer - B In the presence of `FeBr_(3)`, it is an electrophilic substitution reaction. As the product of bromination is meta, it means electron density is more at meta - position than at `o-` and `p-`. The product is m-bromo-nitrobenzene. |
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| 85. |
Which of the following reagents can be used to distinguish nitroethane and nitrobenzene ?A. `Sn//HCl`B. `Zn//NH_(4)Cl`C. `LiAlH_(4)`D. `Fe//HCl`. |
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Answer» Correct Answer - C `LiAlH_(4)` reduces nitroethane to ethylamine and nitrobenzene to azobenzene. `C_(2)H_(5)NO_(2)+6[H] overset(LiAlH_(4))(rarr)C_(2)H_(5)NH_(2)+2H_(2)O overset(LiAlH_(4))(rarr) C_(6)H_(5)N = NC_(6)H_(5)+4H_(2)O` |
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| 86. |
When nitrobenzene is reduced with zinc and methanolic NaOH the product obtained is .A. anilineB. phenyl hydroxylamineC. p-amine phenolD. azo benzene |
| Answer» Correct Answer - D | |
| 87. |
When propane is subjected to the treatment with fuming nitric acid at 673 K which of the following will not form ?A. 1-nitropropaneB. 2-nitropropaneC. nitromethaneD. nitrohexane |
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Answer» Correct Answer - D `{:(H_(3)C-CH_(2)-N=O hArr H_(3)C-CH=N-OH),(" "darr" "darr),(" "O" "O):}` |
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| 88. |
Ethanol on treatment with ethanenitrile in the presence of conc. `H_(2)SO_(4)` followed by hydrolysis will yieldsA. Ethyl ethanoateB. ButyraldehydeC. Methyl propanoateD. 2- Butanone |
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Answer» Correct Answer - A `underset("Ethanenitrile")(CH_(3)CN)+underset("Ethanol")(C_(2)H_(5)OH) overset("Conc. "H_(2)SO_(4))(rarr) [CH_(3)-overset(+NH_(2))overset("||")(C)-OC_(2)H_(5)] HSO_(4)^(-) overset(+H_(2)O //"Boil")(rarr) underset("Ethyl ethanoate")(CH_(3)-overset(O)overset("||")(C)-O-C_(2)H_(5))+NH_(4)HSO_(4)` |
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| 89. |
Primary nitro compounds react with nitrous acid to form nitrolic acids which dissolve in sodium hydroxide to giveA. Yellow solutionB. Blue solutionC. Colourless solutionD. Red solution |
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Answer» Correct Answer - D `{:(R-CH_(2)NO_(2)+HONO rarr RC-NO_(2) overset(NaOH)(rarr) R-C-NO_(2)),(1^(@)" Nitroalkane"" ||"" ||"),(" "N-OH" "NO^(-)Na^(+)),(" Nitrolic acid"" Red colouration"):}` |
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| 90. |
Assertion (A) : Nitrobenzene does not undergo Friedel-crafts reaction. Reason (R) : Nitrogroup in nitrobenzene deactivates the benzene ring.A. Both A and R are true and R is the correct explanation of A.B. Both A and R are true but R is not a correct explanation of A.C. A is true but R is false.D. A is false but R is false. |
| Answer» Correct Answer - A | |
| 91. |
Nitromethane is subjected to treatment with chlorine in the presence of sodium hydroxide, the main product is:A. monochloronitromethaneB. trichloromethaneC. chloropicrinD. none of above |
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Answer» Correct Answer - C `H_(3)C-NO_(2)+3Cl overset(3NaOH)(rarr) underset("Chloropicrin")(C Cl_(3)NO_(2))+3NOCl+3H_(2)O` |
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| 92. |
Which of the following groups will facilitate the electrophilic attack on benzene ring?A. `-NO_(2)`B. `-NH_(2)`C. `-CH_(3)`D. `-OH` |
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Answer» Correct Answer - A Because `-NO_(2)` reduces the electron density on the benzene ring due to `- I` effect density and `- R` effect. |
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| 93. |
Reaction of benzonitrile with methyl magnesium iodide followed by hydrolysis gives :A. tolueneB. acetophenoneC. Benzoic acidD. iodobenzene |
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Answer» Correct Answer - B See properties of cyanides. |
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| 94. |
Aniline is seoarated from aniline-water mixture isA. CeptallizationB. Steam distillationC. Solvent extractionD. sublimation |
| Answer» Correct Answer - B | |
| 95. |
When a primary amine is treated with `CS_(2)` in presence of `HgCl_(2)`, the product formed isA. alkyl cyanateB. alkyl isothiocyanateC. carbyl amineD. alkyl cyanide |
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Answer» Correct Answer - B See Hoffmann mustard oil reaction. |
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| 96. |
Which of the following reaction will not give primary amine ?A. `CH_(3)CONH_(2) overset(KOH, Br_(2))(rarr)`B. `CH_(3)CN overset(LiAlH_(4))(rarr)`C. `CH_(3)NC overset(LiAlH_(4))(rarr)`D. `CH_(3)CONH_(2) overset(LiAlH_(4))(rarr)` |
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Answer» Correct Answer - C Methyl isocyanide would produce secondary amine. `CH_(3)NC overset(LiAlH_(4))(rarr) CH_(3)NHCH_(3)` |
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| 97. |
Which one of the following is not a primary amine ?A. tert-ButylamineB. EthylamineC. sec-ButylamineD. dimethylamine. |
| Answer» Correct Answer - D | |
| 98. |
The substance that gives a primary amine on hydrolysis isA. NitroparaffinsB. AlkylcyanideC. OximeD. Alkylisocyanide |
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Answer» Correct Answer - D `underset("Akyl isocyanide")(R-N equiv C) overset(2H_(2)O //H^(+))(rarr) underset(1^(@)" amine")(R-NH_(2))+HCOOH` |
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| 99. |
Acetaldoxime reacts with `P_(2)O_(5)` to giveA. Methyl cyanideB. Ethyl cyanateC. Ethyl cyandieD. Mixture of all these |
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Answer» Correct Answer - A `CH_(3)-underset(H)underset(|)(C)=NOH underset(-H_(2)O)overset(P_(2)O_(5))(rarr) CH_(3)C=N` |
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| 100. |
Dehydration of primary amides with `P_(2)O_(5)` givesA. CyanidesB. IsocyanidesC. AminesD. Nitrocompounds |
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Answer» Correct Answer - A See preparation of cyanides. |
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