CBSE Class 12 Chemistry Amines VBQs

CBSE Class 12 Chemistry Amines VBQs read and download in pdf. Value Based Questions come in exams for Chemistry in Class 12 and are easy to learn and helpful in scoring good marks. You can refer to more chapter wise VBQs for Class 12 Chemistry and also get latest topic wise very useful study material as per latest NCERT book for Class 12 Chemistry and all other subjects for free on Studiestoday designed as per latest Class 12 CBSE, NCERT and KVS syllabus and examination pattern

VBQ for Class 12 Chemistry Unit 13 Amines

Class 12 Chemistry students should refer to the following value based questions with answers for Unit 13 Amines in Class 12. These VBQ questions with answers for Class 12 Chemistry will come in exams and help you to score good marks

Unit 13 Amines VBQ Questions Class 12 Chemistry with Answers

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:
Amines 1

Answer: A

Question. The correct order of basic strength for the following compounds is:
Amines 2
(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.
Amines 3
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?
Amines 4

Answer: C

Question. The final product (c) in the following sequence of reaction is:
Amines 5

Answer: D

Question. In the reaction
Amines 6

The structure of product A is:
Amines 7

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:
Amines 8

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
Amines 9

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)

class_12_chemistry_vbq


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.

class_12_chemistry_vbq

(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

Unit 08 The d- and f-Block Elements
CBSE Class 12 Chemistry D And F Block Elements VBQs
Unit 12 Aldehydes, Ketones and Carboxylic Acids
CBSE Class 12 Chemistry Aldehydes Ketones And Carboxylic Acids VBQs

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CBSE Class 12 Chemistry Unit 13 Amines VBQs

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