VBQs Amines Class 12 Chemistry

VBQs Amines Class 12 Chemistry with Amines has been provided below for standard students. We have provided chapter wise VBQ for Class 12 Chemistry with Amines. The following Amines Class 12 Chemistry value based questions with answers will come in your exams. Students should understand the concepts and learn the solved cased based VBQs provided below. This will help you to get better marks in class 12 examinations.

Amines VBQs Class 12 Chemistry

Question. In order to distinguish between C₂H₅–NH₂ and C₆H₅–NH₂,which of the following reagent is useful
(a) Hinsberg’s reagent
(b) HNO₂
(c) CHCl₃ + KOH
(d) NaOH

Question. Which of the following is not correct ?
(a) Ethyl amine and aniline both have – NH₂ group
(b) Ethyl amine and aniline dissolve in HCl
(c) Ethyl amine and aniline both react with CHCl₃ and KOH to form unpleasant smelling compound
(d) Ethyl amine and aniline both react with HNO₂ in cold to give hydroxy compounds

Question. Which of the following are intermediates in Sandmeyer reaction ?

(a) (ii) and (iii)
(b) (i) and (iv)
(c) (ii) and (iv)
(d) (i) and (ii)

Question. Benzylamine may be alkylated as shown in the following equation:

Which of the following alkylhalides is best suited for this reaction through S_N1 mechanism?
(a) CH₃Br
(b) C₆H₅Br
(c) C₆H₅CH₂Br
(d) C₂H₅Br

Question. Which of the following reagents will convert p-methylbenzenediazonium chloride into p-cresol?
(a) Cu powder
(b) H₂O
(c) H₃PO₂
(d) C₆H₅OH

Question. Diazonium salt is obtained when aniline reacts with :
(a) cold NaOH
(b) NaNO₂ and HCl (0–5°C)
(c) SnCl₂ at 10°C
(d) N₂O at (0 – 5°C)

Question. Azo dye is prepared by the coupling of phenol and
(a) diazonium chloride
(b) o-nitroaniline
(c) benzoic acid
(d) chlorobenzene

Question. (CH₃)₂CHNH₂ is reacted with excess acetic anhydride, the compound formed is
(a) (CH₃)₂CHNCOCH₃
(b) (CH₃)₂CN(COCH₃)₂
(c) (CH₃)₂CHOH
(d) (CH₃)₂CN(COOCH₃)₂

Question. All three amines 1°, 2°, 3° react with
1. H₂O          2. R–X
3. HCl           4. (CH₃CO)₂O
(a) 1, 2
(b) 4 only
(c) 1, 2, 4
(d) 1, 2, 3

Question. N– ethyl benzene sulphonyl amide is strongly acidic and soluble in alkali due to presence of
(a) strong electron donating sulphonyl group.
(b) strong electron withdrawing sulphonyl group.
(c) weak electron donating sulphonyl group.
(d) weak electron withdrawing sulphonyl group.

Question. Strong activating effect of –NH₂ group is reduced by using
(a) CH₃COCl
(b) CH₃Cl
(c) CH₃ONa
(d) CH₃–CHO

Question. Which of the following compound will not undergo azo coupling reaction with benzene diazonium chloride.
(a) Aniline
(b) Phenol
(c) Anisole
(d) Nitrobenzene

Question. When bromination of aniline is carried out by protecting –NH₂. The product is
(a) o-bromoaniline
(b) 2, 4, 6 tribromoaniline
(c) p-bromoaniline
(d) mixture of o-and p-bromoaniline

Question. Primary amines can be distinguished from secondary and tertiary amines by reacting with
(a) Chloroform and alcoholic KOH
(b) Methyl iodide
(c) Chloroform alone
(d) Zinc dust

Question. Replacement of -N₂⁺Cl- from benzene diazonium chloride by iodine can be done by using
(a) HI
(b) NaOI
(c) PI₃
(d) KI

Question. Which of the following statements is not correct regarding aniline?
(a) It is less basic than ethylamine
(b) It can be steam-distilled
(c) It reacts with sodium to give hydrogen
(d) It is soluble in water

Question. Reaction of aniline with benzaldehyde is
(a) substitution
(b) addition
(c) condensation
(d) polymerization

Question. The product of the following reaction is _________.

(a) (i) and (iii)
(b) (i) and (ii)
(c) (iii) and (iv)
(d) (i), (ii) and (iii)

Question. An organic amino compound reacts with aqueous nitrous acid at low temperature to produce an oily nitrosoamine.
The compound is
(a) CH₃NH₂
(b) CH₃CH₂NH₂
(c) CH₃CH₂NHCH₂CH₃
(d) (CH₃CH₂)₃N

Question. Aniline and other arylamines are usually colourless but get coloured on storage due to___________.
(a) hydrolysis
(b) dehydration
(c) reduction
(d) atmospheric oxidation

Question. Hinsberg’s method to separate amines is based on the use of
(a) benzene sulphonyl chloride
(b) benzene sulphonic acid
(c) ethyl oxalate
(d) acetyl chloride

STATEMENT TYPE QUESTIONS

Question. Which of the following statements are correct ?
(i) Lower aliphatic amines are soluble in water.
(ii) Solubility increases with decrease in molar mass of amines.
(iii) Higher amines are insoluble in water.
(iv) Amines are soluble in organic solvents.
(a) (i), (ii) and (iii)
(b) (i), (iii) and (iv)
(c) (ii), (iii) and (iv)
(d) (i) and (iv)

Question. Which of the following statements are correct ?
(i) In Sandmeyer reaction nucleophiles like Cl^–, Br^– and CN^– are indroduced in benzene ring in the presence of Cu⁺ ion
(ii) In Gattermann reaction nucleophiles are introduced in benzene ring in the presence of copper powder and HCl.
(iii) The yield in Gattermann reaction is found to be better than Sandmayer reaction.
(a) (i) and (ii)
(b) (i), (ii) and (iii)
(c) (ii) and (iii)
(d) (i) and (iii)

Question. Read the following statements and choose the correct option.
(i) Nitrogen atom in amines is sp³-hybridised.
(ii) The geometry of amines is pyramidal.
(iii) The angle C–N–C or C–N–H is slightly more than 109.5°.
(a) (i), (ii) and (iii)
(b) (i) and (ii)
(c) (i) and (iii)
(d) (ii) and (iii)

Question. Which of the following is/are correct regarding nitration of aniline with conc. HNO₃ and conc. H₂SO₄ ?

(iii) The substitution can be explained on the basis of inductive effect (– I)
(iv) The substitution can be influenced by +M and +E effects.
(a) (i), (ii) and (iii)
(b) (ii) and (iii)
(c) (ii) and (iv)
(d) (i) and (iii)

Question. Which of the following statements are correct ?
(i) Primary amines show more intermolecular association than secondary amines.
(ii) Tertiary amines do not show intermolecular association.
(iii) Boiling points of isomeric alkenes follow the order 3° > 2° > 1°
(a) (i) and (iii)
(b) (i) and (ii)
(c) (i), (ii) and (iii)
(d) (ii) and (iii)

Question. In order to prepare a 1° amine from an alkyl halide with simultaneous addition of one CH₂ group in the carbon chain, the reagent used as source of nitrogen is ___________.
(a) Sodium amide, NaNH₂
(b) Sodium azide, NaN₃
(c) Potassium cyanide, KCN
(d) Potassium phthalimide, C₆H₄(CO)₂N–K+

Question. The best reagent for converting, 2-phenylpropanamide into 1- phenylethanamine is ____.
(a) excess H₂/Pt
(b) NaOH/Br₂
(c) NaBH₄/methanol
(d) LiAlH₄/ether

Question. Amongst the following, the strongest base in aqueous medium is ____________.
(a) CH₃NH₂
(b) NCCH₂NH₂
(c) (CH₃)₂ NH
(d) C₆H₅NHCH₃

Question. Which of the following is a 3° amine?
(a) 1-methylcyclohexylamine
(b) Triethylamine
(c) tert-butylamine
(d) N-methylaniline

Question. Which of the following reagents would not be a good choice for reducing an aryl nitro compound to an amine?
(a) H₂ (excess)/Pt
(b) LiAlH4 in ether
(c) Fe and HCl
(d) Sn and HCl

Question. Hoffmann Bromamide Degradation reaction is shown by __________.
(a) ArNH₂
(b) ArCONH₂
(c) ArNO₂
(d) ArCH₂NH₂

Question. The correct IUPAC name for CH₂=CHCH₂ NHCH₃ is
(a) Allylmethylamine
(b) 2-amino-4-pentene
(c) 4-aminopent-1-ene
(d) N-methylprop-2-en-1-amine

Question. The best reagent for converting 2–phenylpropanamide into 2-phenylpropanamine is _____.
(a) excess H₂
(b) Br₂ in aqueous NaOH
(c) iodine in the presence of red phosphorus
(d) LiAlH₄ in ether

Question. Benzylamine may be alkylated as shown in the following equation :
C₆H₅CH₂NH₂ + R—X ⎯⎯⎯⎯→ C₆H₅CH₂NHR
Which of the following alkylhalides is best suited for this reaction through S_N1 mechanism?
(a) CH₃Br
(b) C₆H₅Br
(c) C₆H₅CH₂Br
(d) C₂H₅ Br

Question. The source of nitrogen in Gabriel synthesis of amines is _____________.
(a) Sodium azide, NaN₃
(b) Sodium nitrite, NaNO₂
(c) Potassium cyanide, KCN
(d) Potassium phthalimide, C₆H₄(CO)₂N–K+

Assertion & Reasoning Based MCQs

For question, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
(a) Assertion and reason both are correct statements and reason is correct explanation for assertion.
(b) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.

Question. Assertion : Aniline is a weaker base than cyclohexylamine. 
Reason : Aniline undergoes halogenation even in the absence of a catalyst.

Question. Assertion : Aniline hydrogen sulphate, on heating, forms p-aminosulphonic acid.
Reason : The sulphonic acid group is electron-withdrawing.

Question. Assertion : Controlled nitration of aniline at low temperature mainly gives m-nitroaniline.
Reason : In acidic medium, –NH₂ group gets converted into m-directing group.

Question. Assertion : In Hoffmann bromamide reaction, the amine formed has one carbon atom less than the parent 1° amide.
Reason : N-methyl acetamide undergoes Hoffmann bromamide reaction.

Question. Assertion : In strongly acidic solutions,aniline becomes more reactive towards electrophilic reagents.
Reason : The amino group being completely protonated in strongly acidic solution, the lone pair of electrons on the nitrogen is no longer available for resonance.

Question. Assertion : Ortho substituted anilines are usually weaker bases than anilines.
Reason : This is due to ortho effect.

Question. Assertion : Aniline does not undergo Friedel-Crafts reaction.
Reason : –NH₂ group of aniline reacts with AlCl₃.

Question. Assertion : Me3N reacts with BF₃ whereas Ph₃N does not.
Reason : The electron pair on nitrogen atom in Ph₃N is delocalised in the benzene ring and is not available for boron in BF₃.

Question. Assertion : Boiling point of amines are lower than those of alcohols and carboxylic acids.
Reason : Amines are much more soluble in water than less polar solvents like alcohol, ether, etc.

Question. Assertion : Ammonia is more basic than water.
Reason : Nitrogen is less electronegative than oxygen.

Question. Assertion : Ammonolysis of alkyl halides involves the reaction between alkyl halides and alcoholic ammonia.
Reason : Reaction can be used to prepare 1°, 2°, 3° amines and finally quaternary ammonium salts.

A statement of assertion is followed by a statement of reason. Mark the correct choice from the options given below.
(a) Both assertion and reason are true and reason is the correct explanation of assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Both assertion and reason are false.

Question. Assertion : Benzenediazonium chloride can not be stored and is used immediately after its preparation.
Reason : It is very unstable and dissociates to give nitrogen.

Question. Assertion : Gabriel phthalimide synthesis can be used to convert alkyl chlorides into primary amines.
Reason : With proper choice of reagent Gabriel synthesis can be used to prepare primary, secondary and tertiary amines.

Question. Assertion : In strongly acidic solution aniline becomes less reactive towards electrophilic reagents.
Reason : Due to protonation of amino group the lone pair of electrons on nitrogen is not available for resonance.

Question. Assertion : The diazotisation reaction must be carried in ice cold solution ( 0-4⁰C).
Reason : At higher temperature, benzenediazonium chloride reacts with water to give phenol.

Question. Assertion : N-Ethylbenzenesulphonamide is soluble in alkali.
Reason : Hydrogen attached to nitrogen in sulphonamide is strongly acidic in nature.

One – word answer

Question. Which one is more acidic : anilinium ion or p-fluoroanilinium ion ?

Question. Name the effect due to which nitrobenzene does not undergo Friedal Craft reaction.