Amines(12th Grade > Chemistry ) Questions and answers for exam Preparation

12th Grade > Chemistry

AMINES MCQs

Total Questions : 30 | Page 2 of 3 pages

Question 11. Which one of the following can release foul smelling substance on heating with chloroform and ethanolic KOH

Ethyl amine
Ethanamide
Methyl isocyanide
Ethyl methyl amine

Discuss Question

Answer: Option A. -> Ethyl amine
:
A
Ethyl amine

Which One Of The Following Can Release Foul Smelling Substan...

Question 12. 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

- NH2 becomes - NH -NO2+, which is meta directing
- NH2 becomes - NH +SO4-2, which is meta directing
- NH2 becomes - NH3 +, which is meta directing
In nitration mixture, ortho and para activity of NH3 group is completely lost

Discuss Question

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 13. In the nitration of benzene using a mixture of conc. H₂SO₄ and conc. HNO₃ the Species which initiates the reaction is_______________

NO2
NO+
NO2+
NO2-

Discuss Question

Answer: Option C. -> NO2+
:
C

H_{2} S O_{4} + H N O_{3} \to H_{2} N O_{3}^{+} + H_{S} O_{4}^{-}

H_{2} N O_{3}^{+} \to H_{2} O + N O_{2}^{+}

The electrophile in nitration of benzene is nitronium ion

(N O_{2}^{+})

Question 14. Intermediates formed during the reaction RCONH₂ with Br₂ and KOH are

RCONHBr and RNCO
RNHCOBr and RNCO
RNH - Br and RNCO
RCONBr2

Discuss Question

Answer: Option A. -> RCONHBr and RNCO
:
A
Mechanism of Hoffmann hypobromite reaction

Question 15. Valency of nitrogen in the Zwitter ion form of sulphanilic acid

Discuss Question

Answer: Option C. -> 4
:
C
Maximum valency of nitrogen is 4

Question 16.

Correct statements regarding 'D' is

It is called sulphonic acid
It exists as zwitter ion in aqueous solution
It is an amino acid
It is used as rubber in industry

Discuss Question

Answer: Option B. -> It exists as zwitter ion in aqueous solution
:
B
A = C₆H₆; B = C₆H₅ - NO₂; C = C₆H₅ - NH₂; D = Sulphanilic acid

Question 17.

Phenol, Benzoic acid
Benzene, Benzaldehyde
Aniline, Benzene
Phenol, o - nitrobenzaldehyde

Discuss Question

Answer: Option B. -> Benzene, Benzaldehyde
:
B
B to C is Gattermann - Koach reaction

Question 18. Which of the following is used to distinguish primary, secondary and tertiary amines

CHCl3, KOH
C6H5SO2Cl
p - CH3 - C6H4 - SO2Cl
either b (or) c

Discuss Question

Answer: Option D. -> either b (or) c
:
D
Hiensberg reagent and methyl derivative of it can be used

Question 19. Which of the following amines cannot be prepared by Gabriel Synthesis?

Butyl amine
Isopropyl amine
2-phenylethyl amine
N -methyl benzyl amine.

Discuss Question

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 20. 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