Amines(11th And 12th > Chemistry ) Questions and Answers

Question 1.


Correct Statements regarding 'D' IsCorrect statements regarding 'D' is


  1.     It is called sulphonic acid
  2.     It exists as zwitter ion in aqueous solution
  3.     It is an amino acid
  4.     It is used as rubber in industry
Explanation:-
Answer: Option B. -> It exists as zwitter ion in aqueous solution
:
B

A = C6H6; B = C6H5 - NO2; C = C6H5 - NH2; D = Sulphanilic acid


Question 2.



  1.     1,6
  2.     1,5
  3.     2,4
  4.     2,6
Explanation:-
Answer: Option A. -> 1,6
:
A

Y is CH3 CHO


Question 3.


Assertion (A): Both aromatic and aliphatic primary amines produce stable diazonium salts on diazotization


Reason (R): Aromatic diazonium salt exhibit resonance


  1.     A and R are true and R is the correct explanation of A
  2.     A and R are true and R is not the correct explanation of A
  3.     A is true, R is false
  4.     A is false, R is true
Explanation:-
Answer: Option D. -> A is false, R is true
:
D

Aliphatic amine diazonium salt is unstable


Question 4.


Incorrect order of basic strength of amines in aqueous state 


  1.     (CH3)2NH > CH3NH2> (CH3)3N
  2.     (C2H5)2NH > (C2H5)3N > C2H5NH2
  3.     C2H5NH2> NH3> C6H5NH2
  4.     (C6H5)2NH > C6H5NH2> C2H5NH2
Explanation:-
Answer: Option D. -> (C6H5)2NH > C6H5NH2> C2H5NH2
:
D

Aromatic amine are less basic than aliphatic


Question 5.


Some statements are given about acylation of amines with acid chloride


I. Tertiary amines do not react with acid chloride


II. This reaction is an example of a nuclophilic addition reaction


III. This reaction is carried out in the presence of pyridine


IV. Aliphatic and aromatic primary and secondary amines involve in this reaction


The correct statements is/ are


  1.     I, II, III only
  2.     I, III, IV only
  3.     II only
  4.     IV only
Explanation:-
Answer: Option B. -> I, III, IV only
:
B

Statement II refers to is a nucleophilic substitution reaction


Question 6.


A positive carbyl amine test is given by


1. N, N - Dimethyl aniline


2. 2,4 - Dimethyl aniline


3. N - Methyl - o - methyl aniline


4. p - Methyl benzyl amine


  1.     2, 4
  2.     1, 2, 3
  3.     1, 2 , 4
  4.     1, 4
Explanation:-
Answer: Option A. -> 2, 4
:
A

2 & 4 are 10 amine;  1 is 30 amine;  3 is 20 amine & only 10 amine gives a positive carbyl amine test


Question 7.


Amino group is ortho, para directing for aromatic electrophilic substitution. On nitration of aniline with concentrated acids, a good amount of meta nitro aniline is obtained. This is due to


  1.     - NH2 becomes - NH -NO2+, which is meta directing
  2.     - NH2 becomes - NH +SO4-2, which is meta directing
  3.     - NH2 becomes - NH3 +, which is meta directing
  4.     In nitration mixture, ortho and para activity of NH3 group is completely lost
Explanation:-
Answer: Option C. -> - NH2 becomes - NH3 +, which is meta directing
:
C

NH2 is o & p - directing group where as NH3+ is meta directing group


Question 8.


Which one of the following can release foul smelling substance on heating with chloroform and ethanolic KOH


  1.     Ethyl amine
  2.     Ethanamide
  3.     Methyl isocyanide
  4.     Ethyl methyl amine
Explanation:-
Answer: Option A. -> Ethyl amine
:
A
Ethyl amine
Which One Of The Following Can Release Foul Smelling Substan...
Question 9.


Which of the following amines cannot be prepared by Gabriel Synthesis?


  1.     Butyl amine
  2.     Isopropyl amine
  3.     2-phenylethyl amine
  4.     N -methyl benzyl amine.
Explanation:-
Answer: Option D. -> N -methyl benzyl amine.
:
D
Gabriel pthalamide is used in the preparation of aliphatic and arylalkyl primary amines only

N- methyl benzyl amine(CH3 NH CH2C6H5) being a secondary amine cannot be prepared by this method.


 


Question 10.


Which of the following is used to distinguish primary, secondary and tertiary amines


  1.     CHCl3, KOH
  2.     C6H5SO2Cl
  3.     p - CH3 - C6H4 - SO2Cl
  4.     either b (or) c
Explanation:-
Answer: Option D. -> either b (or) c
:
D

Hiensberg reagent and methyl derivative of it can be used


© Lakshya_Education.com, All Right Reserved.
Contact Us services