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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. |
The compound which on rection with aqueous nirous acid at low temperature produces an oily nitrosamine, isA. methylamineB. ethylamineC. diethylamineD. triethylamine |
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Answer» Correct Answer - C `2^(@)` amine |
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| 52. |
Assertion: Less substituted alkenes are formed in both Hoffmann and Cope elimination reactions. Reason: Hoffmann elimination and Cope elimination both are syn elimination reactions.A. If both assertion and reason are correct, and reason is the correct explanation of the assertionB. if both assertion and reason are correct, but reason is NOT the correct explanation of the assertion.C. If assertion is Correct, but reason in incorrect.D. If assertion is Incorrect, but reason is correct |
| Answer» Correct Answer - C | |
| 53. |
How many mole of NaOH are consumed in Hoffmann Bromamide reaction? |
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Answer» Correct Answer - D `R-CONH_(2)+Br_(2)+4NaOH to 2NaBr+R-NH_(2)+Na_(2)CO_(3)+2H_(2)O` |
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| 54. |
Which of the following orders is correct regarding basicity of indicated molecules?A. N,N-Dimethyl toludinegtp-toluidine gtp-p-nitroanilineB. AnilinegtN,N-dimethyl -p-toludinegtp-toludine gtanilineC. p-Toluidine gtN,N-dimethyl-p-toluidinegtaniline gtp-nitroanilineD. N,N-Dimethyltoluidinegtaniline gtp-toluidine gt p-nitroaniline |
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Answer» Correct Answer - A `-CH_(3)` group is electron releasing group were as `NO_(2)` group is electron withdrawing group |
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| 55. |
The correct order of increasing basicity for the following compounds is A. IVltIltIIIltIIB. IltIIltIIIltIVC. IVltIIIltIIltID. IIltIVltIltIII |
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Answer» Correct Answer - A Order of basic nature of amines |
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| 56. |
The order of basicity of the following compounds is A. IVgtIgtIIIgtIIB. IIIgtIgtIVgtIIC. IIgtIgtIIIgtIVD. IltIIIltIIltIV |
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Answer» Correct Answer - D is least because lone pair is utilised in providing aromaticity. |
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| 57. |
Acid hydrolysis of methyl isocyanide gives:A. `CH_(3)NH_(2)+HCO OH`B. `CH_(3)NH_(2)+CH_(3)CO OH`C. `C_(2)H_(5)NH_(2)+HCO OH`D. `CH_(3)NH_(2)+CH_(3)CH_(2)CO OH` |
| Answer» Correct Answer - A | |
| 58. |
N-ethyl formamide on dehydration with `POCl_(3)` in presence of pyridine gives:A. Ethyl isocyanateB. Ethyl isocyanideC. AcetaldoximeD. Ethyl cyanide |
| Answer» Correct Answer - B | |
| 59. |
Ethyl isocyanide on reduction with sodium and alcohol gives:A. Ethyl amineB. propyl amineC. DimethylamineD. ethyl methyl amine |
| Answer» Correct Answer - D | |
| 60. |
Amines are less reactive in substitution reactions. Their reactivity is much lesser than alcohols and alkylflourides towards substitution. Protonation of the amino group makes it a better leaving group, but not nearly as good a leaving group as a protonated alcohol. Protonated amino groups cannot be displaced by `OH^(-)` because it would react immediately with the acidic hydrogen which would convert it in to a poor nucleophile. The leaving group in quarternary ammonium ion has about the same leaving tendency as a protonated amino group but does not have acidic hydrogen. the reaction of a quarternary ammonium ion with hydroxide ion is known as Hoffmann elimination reaction. The leaving group is tertiary amine. Since a tertiary amine is only a moderately good leaving group, the reaction requires heat. The carbon to hwich the tertiary amine is attached is designated as `alpha` carbon. When the hydroxide ion starts to remove a `beta` H form from a quarternary ammonium ion, the leaving group does not immediately start to leave because a tertiary amine is not a good leaving group. As a result, a partial negative charge bulds up on the carbon from which the proton is removed. Which of the following statements is correct?A. `PK_(a)` value of protonated amine is more than that of protonated alcoholB. `PK_(a)` valued of the protoned amine is less than that of protonated alcoholC. `PK_(a)` value of protonated amine is equals to that of protonated alcoholD. `PK_(a)` value of amine is less than that of alcohol |
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Answer» Correct Answer - A Based on relative strengths of amines and alcohols |
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| 61. |
Activation of benzene by `-NH_2` group can be reduced by treating the compound withA. acetic acidB. acetyl chlorideC. dilute HClD. methyl alcohol |
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Answer» Correct Answer - B Acetyl chloride converts `-NH_(2)` to `-NHCOCH_(3)` which reduces the activation of benzene ring |
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| 62. |
Assertion: `-NH_2` group is less ring activating than `-NHCOCH_3` group Reason: Because in `-NHCOCH_3` the lone pair on N atom is conjugated not only with benzene nucleus but also with `gt C = O` group called cross-conjugated.A. If both assertion and reason are correct, and reason is the correct explanation of the assertionB. if both assertion and reason are correct, but reason is NOT the correct explanation of the assertion.C. If assertion is Correct, but reason in incorrect.D. If assertion is Incorrect, but reason is correct |
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Answer» Correct Answer - D `-NH_(2)` is strongly activating group then `-NHCOCH_(3)` |
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| 63. |
Which one of the following is the strongest base in aqueous solution?A. TrimethylamineB. AnilineC. DimethylamineD. Methylamine |
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Answer» Correct Answer - C `2^(@) gt 3^(@) gt 1^(@) gt NH_(3)` |
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| 64. |
Which of the following orders is true regarding the basic nature of `NH_2` group?A. o-Toluidine gtaniline gto-NitroanilineB. o-Toluidine ltAniline gto-NitroanilineC. o-Toluidine ltAniline gto-NitroanilineD. o-ToluidinegtAniline lt o-Nitroaniline |
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Answer» Correct Answer - B Electron releasing increase the availability of lone pair of electrons on nitrogen. While electron attracting group decreases this availability |
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| 65. |
Assertion: Benzylamine is more basic than aniline. Reason: `NH_2` group is electron releasing groupA. A and R are true and R is the correct explanation of AB. A and R are true and R is not the correct explanation of AC. A is true R is falseD. A is false R is true |
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Answer» Correct Answer - B Bezylamine is aliphatic primary amine |
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| 66. |
For the conversion of Aniline to N-Methyle aniline, the reagent used isA. `CH_(3)I`B. `C_(6)H_(5)Cl`C. `CH_(4)`D. `CH_(3)NH_(2)` |
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Answer» Correct Answer - A Alkylation |
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| 67. |
Which of the following reagents would not be a good choice for reducing an aryl nitro compound to an amine?A. `H_(2)` (excess) /PtB. `LiAlH_(4)` in etherC. Fe and HClD. Sn and HCl |
| Answer» Correct Answer - B | |
| 68. |
Acetophenone can be converted into amine in a single step byA. `Br_(2)//KOH`B. `H_(2)O // OH^(-)`C. `NH_(3)//H_(2), Ni //Delta`D. `NH_(2)OH` |
| Answer» Correct Answer - C | |
| 69. |
Aniline can be industrially prepared from nitro benzene by usingA. `LiAlH_(4)`B. `Na//C_(2)H_(5)OH`C. Sn/HClD. Fe steam and HCl |
| Answer» Correct Answer - D | |
| 70. |
The correct IUPAC name for `CH_2 ==CH CH_2 NH CH_3` isA. allyl methylamineB. 2-amino-4-penteneC. 4-aminopent-1 eneD. N-methylprop-2-en-1-amine |
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Answer» Correct Answer - D IUPAC name of `C^(3)H_(2)==C^(2)CHCoverset(1)(H_(2))NHCH_(3)` is N-methylprop -2-en-1 -amine hence, option (d) is correct. |
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| 71. |
The IUPAC name of the amine is : A. N-Ethyl 2, 3 dimethyl cyclopentanamineB. N-ethyl 3,4 dimethyl cyclopentanamineC. N-3,4 dimethyl cyclopentanamine ethanamineD. N-Ethyl 3,3 dimethyl cyclopentanamine. |
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Answer» Correct Answer - B N-ethyl 3,4 dimethyl cyclopentanmine |
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| 72. |
IUPAC name of anilineA. phenylamineB. Amino benzeneC. Bezyl amineD. Benzenamine |
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Answer» Correct Answer - D Aromatic compound. |
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| 73. |
Which of the following systematic name & names are correct for A. Only DB. A and B onlyC. A,B,C onlyD. a,B,C and D |
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Answer» Correct Answer - C Least sum rule |
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| 74. |
Arrange basicity of given compounds in decreasing order. a) `CH_3 - CH_2 - NH_2 ` b) `CH_2 = CH - NH_2` c) `CH -= C - NH_2` d) `C_6 H_5 -NH_2` |
| Answer» Correct Answer - 1 | |
| 75. |
Acetamide is treated Separately with the following reagents. Which one of these would give methylamine?A. `PCl_(5)`B. SodalineC. `NaOH+Br_(2)`D. Hot concentrated `H_(2)SO_(4)` |
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Answer» Correct Answer - C `CH_(3)-CO-NH_(2)overset(4NaOH+Br_(2))to CH_(3)NH_(2)+Na_(2)CO_(3)+2NaBr+2H_(2)O` |
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| 76. |
Methylamine reacts with `HNO_(2)` to form….A. `CH_(3)-0-N=0`B. `CH_(3)-0-CH_(3)`C. `CH_(3)OH`D. `CH_(3)CHO` |
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Answer» Correct Answer - C Methylamine reacts with `HNO_(2)` (nitrous acid) to form methanol. `underset("Methylamine")(CH_(3)-NH_(2))toCH_(3)underset("Methanol")underset(CH_(3)OH)underset(darr)(overset(N_(2))overset(-)(Cl))` |
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| 77. |
Which statement is correct?A. Phenol and aniline give coupling reaction with diazonium saltB. Phenol couples with diazonium salt in mild basic conditions (pH=8-10)C. Aniline couples with diazonium salt in mild acidic condition (pH=4-6)D. Both phenol and aniline cuple with diazonium salt in neutral condition (pH=7) |
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Answer» Correct Answer - A::B::C Only aryl dizonium salts are stable |
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| 78. |
The amines that will give off `N_2 ` upon treatment with `NaNO_2` and dil. `H_2 SO_4` at 0 to `5^@C` is (are)A. B. C. D. |
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Answer» Correct Answer - A::C Only aliphatic `1^(@)` -amines give nitrogen with `HNO_(2)` |
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| 79. |
Aniline dissolves in HCl due to the formation ofA. anilinium chlorideB. o-chloroanilineC. AzodyeD. diazonium chloride |
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Answer» Correct Answer - A `C_(6)H_(5)NH_(2)+HCl to C_(6)H_(5)overset(+)(N)H_(3)overset(-)(C)l` |
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| 80. |
When aniline is heated with chloroform and caustic potash solution, we getA. phenyliso cyanideB. o-chloroanilineC. benzoic acidD. phenol |
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Answer» Correct Answer - A `C_(6)H_(5)NH_(2)+3KOH+CHCl_(3) to C_(6)H_(5)NC+3KCl+3H_(2)O` |
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| 81. |
In the diazotisation of anline with sodium nitrite and hydrochloride acid, an excess of hydrochloric acid is used primarily toA. Supress the concentration of free aniline available for couplingB. supress hydrolysis of phenolC. Ensure a stiochiometric amount of nitrous acidD. Neutralise the base liberated |
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Answer» Correct Answer - A Excess of HCl is used to convert free aniline to aniline hydrochloride. Other wise free aniline would undergo coupling reaction with benzene diazonium chloride |
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| 82. |
The only stable organic functional group in which carbon is divalent isA. `, C Cl_(2)`B. `: CH_(2)`C. `: CBr_(2)`D. R-NC |
| Answer» Correct Answer - D | |
| 83. |
Electrophilic and Nucleophilic reagents give addition on the same atom of the molecule inA. CyanideB. IsocyanideC. AldehydeD. Ketone |
| Answer» Correct Answer - B | |
| 84. |
Which of the following reagents are correct for the given reaction? A. (i) `NaNO_(2) +HCl, 0-5^(@)C (ii) H_(3)PO_(2)`B. `(i) KNO_(2)+HBr, 0-5^(@)C (ii) Na_(2)SnO_(2)`C. `(i) HNO_(2) (ii) C_(2)H_(5)OH ` and heatD. (i) `KNO_(2)+HCl (ii) H_(2)O` (steam) |
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Answer» Correct Answer - A::B::C Diazonium ion can be replaced by H by (A) `H_(3)PO_(2)` or (B) `Na_(2)SnO_(2)` or `(C) C_(2)H_(5)OH` and heat. |
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| 85. |
Fluorobenzene `(C_(6)H_(5)F)` can be synthesized in the laboratory .A. by heating phenol with HF and KFB. from aniline bydiazotisation followed by heating the diazonium salt with `HBF_(4)`C. by direct fluorination of benzene with `F_(2)` gasD. by reacting bromobenzene with NaF solution |
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Answer» Correct Answer - B `C_(6)H_(5)NH_(2)overset(NaNO_(2))underset(HCl)to C_(6)H_(5)N_(2)Cl overset(HBF_(4))toC_(6)H_(5)F` |
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