CBSE Class 12 Chemistry Amines VBQs

MULTIPLE CHOICE QUESTIONS

Question. In the nitration of benzene using a moisture of Conc H₂SO₄ and conc. HNO₃ the species which initiates the reaction is:
(a) NO₂
(b) NO⁺
(c) NO₂⁺
(d) NO₂^–

Answer: C

Question. The correct IUPAC name of Cu₂ = CH—CH₂NHCH₃ is:
(a) Allymethyl amine
(b) 2-amino-4-pentene
(c) 4-aminopent-lene
(d) N-methylprop-2-en-anine

Answer: D

Question. Which is the weakest base:

Answer: A

Question. The correct order of basic strength for the following compounds is:

(a) ii < iii < i
(b) iii < i < ii
(c) iii < ii < i
(d) ii < i < iii

Answer: C

Question. Methylamine reacts with HNO₂ to form
(a) CH₃—O—N==0
(b) CH₃OCH₃
(c) CH₃OH
(d) CH₃CHO

Answer: C

Question. CH₃CH₂COOH
The structure of ‘c’ would be
(a) CH₃CH₂CO NH₂
(b) CH₃CH₂NHCH₃
(c) CH₃CH₂NH₂
(d) CH₃CH₂CH₂NH₂

Answer: C

Question.

Answer: C

Question. Which of the following statement about primary amine is false:
(a) Aryl amines react with nitrous acid to produce phenol
(b) Alkylamines are stronger base than ammonia
(c) Alkyl amines are stronger base than aryl amines
(d) Alkyl amines react with nitrous acid to produce alcohol

Answer: A

Question. Which of the following is most stable diazoniom salt?
(a) CH₃N₂⁺ X^–
(b) C₆H₅N₂⁺ X^–
(c) CH₃CH₂N₂⁺ X^–
(d) C₆H₅CH₂N₂⁺ X^–

Answer: B

Question. Method by which aniline can not be prepared is:
(a) reduction of nitrobenzene with H₂/Pd in ethanol.
(b) potassium salt of phthalimide treated with chlorobenzene
(c) hydrolysis of phenyl isocyanide with acidic solution
(d) degradation of benzamide with bromine in alkaline medium solution.

Answer: B

Question. In the chemical reaction:
CH₃CH₂NH₂ + CHCl₃ + 3KOH → A + B + 3H₂O
The compound A and B are respectively:
(a) CH₃CH₂CONH₂ and 3KCl
(b) CH₃CH₂NC + K₂CO₃
(c) CH₃CH₂NC and 3KCl
(d) CH₃CH₂CNB + 3KCl

Answer: C

Question. Considering the basic strength of amines in aqueous solution which one has the smallest pkb value?
(a) (CH₃)₂NH
(b) C₆H₅NH₂
(c) CH₃NH₂
(d) (CH₃)₃N

Answer: A

Question. Which of the following compound will give significant amount of meta product during mono-nitration reaction?

Answer: C

Question. The final product (c) in the following sequence of reaction is:

Answer: D

Question. In the reaction

The structure of product A is:

Answer: A

Question. A positive carbylamine test is given by
(a) N< N-Dimethylaniline
(b) 2, 4-Dimethylaniline
(c) N-Methyl-0-methylaniline
(d) p-methylbenzylamine

Answer: B,D

Question. Which of the following reactions form benzylamine:

Answer: A,D

Question. Which reagent among the following can affect the conversion?
CH₃—C≡≡N → CH₃CH₂NH₂
(a) H₂, Pt
(b) Ammonical AgNO₃
(c) LiA/H₄
(d) NaBH₄

Answer: A,C

Question. In which of the following amines,the first has lower pkb value than the second
(a) aniline, m-nitroaniline
(b) m-Toluidine, p-toluidine
(c) aniline, p-chloroaniline
(d) aniline, p-aminophenol

Answer: A,C

Question. Bromobenzene can be prepared from benzene diazonium chloride. When its is treated with
(a) Cu/HBr
(b) Br₂; HBr
(c) CuBr/HBr
(d) Br₂, CCl₄

Answer: A,C

Assertion Reason Type Questions

The question given below consist of an Assertion and the Reason. Use the following key to choose the appropriate answer.
(a) Assertion and reason both are CORRECT and reason is the CORRECT explanation of the assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Assertion and reason both are correct statements but reasson is not correct explanation of assertion.

Assertion and Reasoning

Question. Assertion : n-Propylamine has higher boiling point than trimethylamine.
Reason : Among n-propylamine molecules, there is hydrogen bonding but there is not hydrogen bonding in trimethylamine.

Answer: A

Question. Assertion : Aniline does not undergo Friedel Crafts reaction.
Reason : Friedel Crafts reaction is an electrophilic substitution reaction.

Answer: B

Question. Match column 1 and column II
Column-I                                                           Column-II
(A) Ammolysis                                               (p) Amine with lesser no. of carbon atom
(B) Gabriel phthalimide                                  (q) Detection of primary amine
(C) Hoffmann bromide amide degradation       (r) Reaction of pthalimide with KOH and R—X
(D) Carbylamine reaction                               (s) Reaction of alkyl halides with NH₃
(a) A–s, B–r, C–p, D–q
(b) A–p, B–q, C–r, D–s
(c) A–r, B–s, C–p, D–q
(d) A–s, B–r, C–q, D–p

Answer: A

Question. Match column 1 and column II
Column-I                                                   Column-II
(A) Benzene sulphonyl chloride                   (p) zwitter ion
(B) Sulphanilic acid                                   (q) Hinsberg reagent
(C) Alkyl diazonium salts                           (r) Dyes
(D) Aryl diazonion salts                             (s) Conversion to alcohols
(a) A–p, B–q, C–s, D–r
(b) A–q, B–p, C–s, D–r
(c) A–q, B–p, C–r, D–s
(d) A–s, B–r, C–q, D–p

Answer: B

Question. The no. of amines having pkb less than C₆H₅NH₂ among the following.
P—CH₃—C5H₄ NH₂, O—CH₃—C₆H₄NH₄, m—CH₃C₆H₄—NH₂, C₆H₅N(CH₃)₂,
C₆H₅NHCH₃, p—NO₂C₆H₄ NH₂, p—ClC₆H₄NH₂, C₆H₅CH2NH2, C₆H₅CH₂CH₂NH₂

Answer: 7

More Questions

Question. Sushil’s friend want to play Holi with synthetic colours, eggs, muddy water etc. Sunil persuades his friends to play Holi with natural colours. He reminds them that last time one of their friends had developed skin allergy after playing Holi with synthetic colours. It took him along time to recover. Sushil’s friends agreed and prepared natural colours using leaves and flowers.

(i) Mention the values shown by Sushil.

(ii) Write the names and reaction of preparation of two azo dyes (synthetic)

Answer:

(i) Environmental conservation, respect of multireligious and multicultural country.

(ii)

Question. A mother brought her 2 year old child to a clinic with a complaint thatthe child would not stop crying and was profusely vomiting. The doctornoticed the child shirt colarcolour was faded.

a) Why dyes are coloured? Give 2 reasons?

b) What is coupling reaction? Give equation

c) What are the values involved in this?

Answer:

(a) Dyes are aromatic compounds their structure includes aryl rings which have delocalized electron systems. These are responsible for the absorption of electromagnetic radiation Of varying wavelengths transmitting the rest to the eye.

(b) Arenediazonium salts react with highly reactive aromatic compounds such as phenols andamines to form bright coloure dazo compounds. This reaction is called coupling reaction.

(c) Keen observation.

Question. A solution contains 1 g mol each of p-toluenediazonium chloride and pnitrophinyldiazonium chloride. To this 1 g mol of alkaline solution of phenol is added. Predict the major product. Explain your answer. While performing this chemical reaction Rohit utilized resources as minimum as possible. Why did he do so, justify your answer in tow lines, writing down any one basic value associated.

Question. Dyes are an important class of organic compounds. A class of organic compounds containing nitrogen are used as a starting material for the manufacture of azo dyes. It reacts with nitrous acid to form diazonium salt, which can undergo coupling reaction to form azo compound. Low molecular weight compounds are toxic, and some are easily absorbed through the skin. Many higher molecular weight compounds are, biologically, highly active. Identify the the compounds and write the value associated with it.

Question. Rahgu and Raghav took organic compound synthesis as their chemistryproject. They prepare benzenediazonium chloride. Raghu wanted to store it and synthesis dye from it next day but Raghav said we can store its and need to use immediately after preparation. Whom do you think is right and why? Write the value associated with it. 

Question. Creatinine is a break-down product of creatine phosphate in muscle, and is usually produced at a fairly constant rate by the body. It belong to amines. Its presence can be tested in our blood and urine. Does this test help us to be aware of our health? Explain. Write the value associated with it.

Question. A primary amine RNH₂ can be reacted with CH₃-X to get secondary amine R- NHCH₃ but the only disadvantage is that 3⁰ amine and quarternary ammonium salts are also obtained as side products. Can you suggest a method where RNH₂ forms only 2⁰ amine? Does knowing special method of preparation of a compound someone has any of 02 values think and write.

Please refer to the link below for CBSE Class 12 Chemistry - Amines VBQs