CBSE Class 12 Chemistry Amines MCQs Set B

Question. Acetamide is treated with the following reagents separately. Which one of these would yield methyl amine?
(a) NaOH-Br₂
(b) Sodalime
(c) Hot conc.H₂SO₄
(d) PCl₅ 

Answer : A

Question. Which one of the following on reduction with lithium aluminium hydride yields a secondary amine?
(a) Methyl isocyanide
(b) Acetamide
(c) Methyl cyanide
(d) Nitroethane

Answer : A

Question. Electrolytic reduction of nitrobenzene in weakly acidic medium gives
(a) N-phenylhydroxylamine
(b) nitrosobenzene
(c) aniline
(d) p-hydroxyaniline.

Answer : C

Question. The correct sequence of reactions to convert p-nitrophenol into quinol involves
(a) reduction, diazotisation and hydrolysis
(b) hydrolysis, diazotisation and reduction
(c) hydrolysis, reduction and diazotisation
(d) diazotisation, reduction and hydrolysis

Answer : A

Question.

(a) CH₃Br
(b) CH₃CONH₂
(c) CH₃NH₂
(d) CHBr₃ 

Answer : C

Question. In the chemical reaction,
CH₃CH₂NH₂ + CHCI₃ + 3KOH → A + B + 3H₂O
The compounds A and B are respectively
(a) CH₃CH₂CONH₂ and 3KCI 
(b) C₂H₅NCand K₂CO₃
(c) C₂H₅NCand 3KCI
(d) C₂H₅CNand 3KCI  

Answer : C

Question. Why do 2° and 3° amines fail to undergo the carbylamine test?
(a) They combine with chloroform to give a stable compound
(b) They react with alcoholic KOH
(c) The nitrogen atom of the amine group does not have the required number of hydrogen atoms
(d) All the given reasons are conect

Answer : B

Question. C₂H₅NH₂ →^HNO₂ A →^PCI B →^NH3 C.
Recognize the compound C from the following
(a) propanenitrile
(b) methylamine
(c) ethylamine
(d) acetamide

Answer : C

Question. Consider the following reaction,
C₆H₅NO₂ →^Sn/HCI X →^C₆H₅COCI Y + HCl What is Y ?
(a) Acetanilide
(b) Benzanilide
(c) Azobenzene
(d) Hydrazobenzene

Answer : B

Question. Which of the following is most basic in nature?
(a) NH₃
(b) CH3NH₂
(c) (CH₃)₂NH
(d) C₆H₅N(CH₃)₂ 

Answer : C

Question. Given the following sequence of reactions,

Answer : A

Question. Amino group is ortho,para-directing for aromatic electrophilic substitution. On nitration of aniline, a good amount of m-nitroaniline is obtained. This is due to
(a) in nitration mixture, ortho, para-activity of NH₂ group is completely lost 
(b) —NH₂ becomes —NH⁺₃, which is m-clirecting
(c) —NH₂ becomes —NH⁺SO^–₄ , which is m-clirecting
(d) —NH₂ becomes —NH^–SO⁺₂ , which ism-directing  

Answer : A

Question. Choose the amide which on reduction with LiAIH4 yields a secondary amine
(a) ethanamide
(b) N-methylethanamide
(c) N, N-dimethylethanamide
(d) phenylmethanamide

Answer : B

Question. The correct order of the basic strength of methyl substituted amines in aqueous solution is       
(a) CH₃NH₂ > (CH₃)2NH > (CH₃)₃N
(b) (CH₃)₂NH > CH₃NH₂ > (CH₃)₃N
(c) (CH₃)₃N > CH₃NH₂ > (CH₃)₂NH
(d) (CH₃)₃N > (CH₃)₂NH > CH₃NH₂ 

Answer : B

Question. Nitration of aniline in strong acidic medium also gives m-nitroaniline because
(a) inspite of substituents nitro group always goes to only m-position
(b) in electrophilic substitution reactions amino group is meta directive
(c) in absence of substituents nitro group alwaysgoes to m-position
(d) in acidic (strong) medium aniline is present as anilinium ion.

Answer : D

Question. The correct statement regarding the basicity of arylamines is
(a) arylamines are generally more basic than alkylamines because of aryl group
(b) arylamines are generally more basic than alkylamines, because the nitrogen atom in arylamines is sp-hybridised
(c) arylamines are generally less basic than alkylamines because the nitrogen lone-pair electrons are delocalised by interaction with the aromatic ring p-electron system
(d) arylamines are generally more basic than alkylamines because the nitrogen lone-pair electrons are not delocalised by interaction with the aromatic ring p-electron system.

Answer : C

Question. Phenyl isocyanides are prepared by which of the following reaction?
(a) Reimer–Tiemann reaction
(b) Carbylamine reaction
(c) Rosenmund’s reaction
(d) Wurtz reaction

Answer : B

Question. The compound obtained by heating a mixture of ethylamine and chloroform with ethanolic potassium hydroxide (KOH) is
(a) an amide
(b) an amide and nitro compound
(c) an ethyl isocyanide
(d) an alkyl halide.

Answer : C

Question. The action of nitrous acid on an aliphatic primary amine gives
(a) secondary amine
(b) nitro alkane
(c) alcohol
(d) alkyl nitrite.

Answer : C

Question. Which one of the following order is wrong, with respect to the property indicated?
(a) Benzoic acid > phenol > cyclohexanol (acid strength)
(b) Aniline > cyclohexylamine > benzamide (basic strength)
(c) Formic acid > acetic acid > propanoic acid (acid strength)
(d) Fluoroacetic acid > chloroacetic acid >bromoacetic acid (acid strength)

Answer : B

Question. For carbylamine reaction, we need hot alcoholic KOH and
(a) any primary amine and chloroform
(b) chloroform and silver powder
(c) a primary amine and an alkyl halide
(d) a monoalkylamine and trichloromethane.

Answer : A

Question. Which product is formed, when acetonitrile is hydrolysed partially with cold concentrated HCl?
(a) Methyl cyanide
(b) Acetic anhydride
(c) Acetic acid
(d) Acetamide

Answer : D

Question. Which of the following reactions is appropriate for converting acetamide to methanamine?
(a) Hoffmann hypobromamide reaction
(b) Stephen’s reaction
(c) Gabriel phthalimide synthesis
(d) Carbylamine reaction

Answer : A

Question. Which of the following will be most stable diazonium salt RN₂⁺X –?       
(a) CH₃N₂⁺X^–
(b) C₆H₅N₂⁺X^–
(c) CH₃CH₂N₂⁺X^–
(d) C₆H₅CH₂N₂⁺X^–

Answer : B

Question. Aniline is reacted with bromine water and the resulting product is treated with an aqueous solution of sodium nitrite in presence of dilute hydrochloric acid. The compound so formed is converted into a tetrafluoroborate which is subsequently heated to dry. The final product is
(a) p-bromoaniline
(b) p-bromofluorobenzene
(c) 1, 3, 5-tribromobenzene
(d) 2, 4, 6-tribromofluorobenzene.

Answer : D

Question. Nitrobenzene on reaction with conc. HNO3/H2SO4 at 80–100°C forms which one of the following products?
(a) 1, 4-Dinitrobenzene
(b) 1, 2, 4-Trinitrobenzene
(c) 1, 2-Dinitrobenzene
(d) 1, 3-Dinitrobenzene

Answer : D

Question. Method by which aniline cannot be prepared is
(a) degradation of benzamide with bromine in alkaline solution
(b) reduction of nitrobenzene with H2/Pd in ethanol
(c) potassium salt of phthalimide treated with chlorobenzene followed by hydrolysis with aqueous NaOH solution
(d) hydrolysis of phenylisocyanide with acidic solution.

Answer : C

Question. The electrolytic reduction of nitrobenzene in strongly acidic medium produces
(a) azobenzene
(b) aniline
(c) p-aminophenol
(d) azoxybenzene.

Answer : C

Question. Name of method use to separate primary, secondary and tertiary amines is
(a) Hofmann method
(b) Lucas method
(c) Victor Meyer method
(d) Kolbe method

Answer : A

Question. Comparing basic strength of NH₃ , CH₃ NH₂ and C₆H₅NH₂ it may be concluded that 
(a) basic strength remains unaffected
(b) basic strength of alkyl amines is lowest
(c) basic strength of aryl amines is lowest
(d) basic strength of NH₃ is highest   

Answer : C

Question. Which of the following is strongest base?
(a) C₆H₅NH₂
(b) p -NO₂—C₆H₄NH₂
(c) m-NO₂—C₆HNH₂
(d) C₆H₅CH₂NH₂   

Answer : D

Question. Intermediates formed during reaction of RCONH₂ with Br₂ and KOH are   
(a) RCONHBr and RNCO
(b) RNHCOBr and RNCO
(c) RNH – Br and RCONHBr
(d) RCONBr₂ 

Answer : A

Question. Amides may be converted into amines by a reaction named after
(a) Hoffmann
(b) Claisen
(c) Perkin
(d) Kekule.

Answer : A

Question. Indicate which nitrogen compound amongst the following would undergo Hoffmann reaction (i.e.,reaction with Br2 and strong KOH) to furnish the primary amine (R–NH₂)?
(a) RCONHCH₃
(b) RCOONH₄
(c) RCONH₂
(d) R – CO – NHOH

Answer : C

Question. On hydrolysis of a “compound”, two compounds are obtained. One of which on treatment with sodium nitrite and hydrochloric acid gives a product which does not respond to iodoform test. The second one reduces Tollens’ reagent and Fehling’s solution. The “compound” is
(a) CH₃CH₂CH₂NC
(b) CH₃CH₂CH₂CN
(c) CH₃CH₂CH₂ON O
(d) CH₃CH₂CH₂CON(CH₃)₂

Answer : A

Question. Which of the following statements about primary amines is false?
(a) Alkyl amines are stronger bases than aryl amines.
(b) Alkyl amines react with nitrous acid to produce alcohols.
(c) Aryl amines react with nitrous acid to produce phenols.
(d) Alkyl amines are stronger bases than ammonia.

Answer : C

Question. Which of the following is more basic than aniline?
(a) Benzylamine
(b) Diphenylamine
(c) Triphenylamine
(d) p-Nitroaniline

Answer : A