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NEET Chemistry MCQ
Compounds Containing Nitrogen Mcq Neet Chemistry
Quiz 1
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Q.1
than one correct answers Q66) C3H9N represente(s)
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a) p-amine
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b) s-amine
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c) t-amine
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d) all of these
Explanation
Answer : (d)
Q.2
Amines are more basic than
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a) alcohols
0%
b) ethers
0%
c) esters
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d) all of the above
Explanation
Answer : (d)
Q.3
Which of the following amine will give the carbylamine test?[ NEET 2020]
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Answer: (c)
Q.4
Among the following, the reaction that proceeds through an electrophilic substitution, is: [ NEET 2019]
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a)
0%
b)
0%
c)
0%
d)
Explanation
Answer: (c)
Q.5
he major product of the following reaction is: [NEET 2019]
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Both aliphatic and aromatic primary amines reacts with Aldehydes to form Schiff's base R-CHO + H2NR → R-CH = NR is called Schiff's base Answer:(b)
Q.6
The correct order of the basic strength of methyl substituted amines in aqueous solution is : ..... [NEET 2019]
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a) (CH3)2NH > CH3NH2> (CH3)3N
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b) (CH3)3N > CH3NH2> (CH3)2NH
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c) (CH3)3N > (CH3)2NH > CH3NH2
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d) CH3NH2 > (CH3)2NH > (CH3)3N
Explanation
Answer: (a)
Q.7
Which of the following compounds can form a zwitterion ? [ NEET 2018]
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a) Benzoic acid
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b) Acetanilide
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c) Aniline
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d) Glycine
Explanation
Answer: (d)
Q.8
Acetaldoxime reacts with P2O5 to produce [ AFMC 1997]
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a) ethyl cyanide
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b) propyl cyanide
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c) methyl cyanide
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d) none of these
Explanation
CH3CHO + H2NOH → CH3CH = N - OH Dehydratio of CH3CH = N - OH in presence of P2P5 gives CH3-CN (Methyl Cyanide) Answer: (c)
Q.9
The basicity of aniline is less than that of cyclohexamine. This is due to [ AFMC 2010]
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a) + R effect of -NH2
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b) - I effect of -NH2
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c) - R effect of -NH2
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d) hyperconjugation of effect
Explanation
The reason for the lesser basicity of aniline as compared to that of cyclohexylamine is +R effect of -NH2 group(i.e. electron releasing resonance effect of -NH3 the -OH and -NH2 groups withdraw electrons by inductive effect (-I). However they also release electrons by delocalization of lone pairs (+R effect). Since the resonance effect is more stronger than inductive effect the net result is electron releasing to rest of the molecule Answer:(a)
Q.10
In the diazotization of arylamines with sodium nitrate and hydrochloric acid, an excess of hydrochloric acid is used primarily to.. [ AFMC 2011]
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a) Suppress the concentration of free aniline available for coupling
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b) Suppress hydrolysis of phenol
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c) Ensure a stoichiometric amount of nitrous acid
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d) Neutralise the base liberated
Explanation
Excess of HCl is used to convert free aniline to aniline hydrochloride otherwise free aniline would undergo coupling reaction with benzenediazonium chloride Answer: (a)
Q.11
Among the following which one does not act as an intermediate in Hofmann rearrangement ... [ AFMC 2009]
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a) RNCO
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b)
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c)
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d) RNC
Explanation
RCO NH2 + Br2 + KOH → RCONHBr + KBr + H2O RCONHBr + KOH →RNCO + KBr + H2O RNCO + 2KOH → RNH2 + K2CO3 Total reaction: RCO NH2 + Br2 + 4KOH → RNH2 + 2KBr + K2CO3 + 2H2O Answer: (d)
Q.12
Melting points are normally highest for .. [ AFMC 2009]
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a) tertiary amides
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b) secondary amides
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c) primary amides
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d) amines
Explanation
Due to presence of intermolecular H-bonding, amides have higher melting and boiling points. Answer: (c)
Q.13
Phenyl isocyanide test is used to identify ... [ AFMC 1998]
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a) Aromatic primary amine
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b) Aromatic tertiary amine
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c) Quaternary ammonium compound
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d) secondary amine
Explanation
Both aliphatic and aromatic primary amines react with chloroform and an alcoholic solution of KOH to produce isocyanide having unpleasant od our Answer:(a)
Q.14
Which of the following reacts with chloroform and base to form phenyl isocyanide [ AFMC 1997]
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a) phenol
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b) benzene
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c) nitrobenzene
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d) aniline
Explanation
This is carbylamine reaction or isocyanide test. Aromatic and aliphatic amines when warmed with CHCl3 and alcoholic KOH give isocyanide having very unpleasant odours. This reaction is used to distinguish promary amine from secondary and tertiary amines which do not give test Answer: (d)
Q.15
Primary and secondary amines are distinguished by
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a) NH3
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b) HNO2
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c) HOCl
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d) Br2/KOH
Explanation
Primary amines with HNO2 yield alcohol whereas secondary amines yield nitrosoamine (oily liquid) on reaction with HNO2 Answer : (b)
Q.16
Benzaldehyde reacts with methyl amine to give ... [ Roorkee 1997]
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a) C6H5NH2
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b) C6H5CH2NH2
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c) C6H5CH = NCH3
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d) C6H5CONH2
Explanation
C6H5CH = O + H2NCH3 → C6H5CH = NCH3 Answer : (c)
Q.17
Which of the following gives primary amine on reduction?
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a) CH3CH2 - O - N = O
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b) CH3CH2NC
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c) CH3CH2NO2
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d) C6H5N = NC6H5
Explanation
Nitrocompounds on reduction yield primary amines Answer : (c)
Q.18
Which reaction sequence would be best to prepare 3-chloroaniline from benzene?
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a) Nitration, reduction, chlorination
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b) Nitration, reduction, acetylation, chlorination, hydrolysis
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c) Chlorination, nitration, reduction
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d) Nitration, chlorination, reduction
Explanation
Answer : (d)
Q.19
The order of basic strength among the following amines in benzene solution is
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a) CH3NH2 > (CH3)2NH > (CH3)3N
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b) (CH3)3N > CH3NH2 > (CH3)2NH
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c) CH3NH2 > (CH3)3N > (CH3)2NH
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d) (CH3)3N > (CH3)2NH > CH3 NH2
Explanation
In non-aqueous solvents and in vapour phase basic strength of alkyl amines follows the order Tertiary amines > Secondary amines > Primary amines Answer : (d)
Q.20
An organic amino compound reacts with aqueous nitrous acid at low temperature to produce an oily nitrosoamine. the compound is ... [ DEC 2003]
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a) CH3NH2
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b) CH3CH2NH.CH2CH3
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c) (CH3CH2)3N
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d) CH3CH2NH2
Explanation
Both aliphatic and aromatic secondary amines react with nitrous acid to give a yellow oily liquid called nitrosoamines Answer : (b)
Q.21
Which of the following reactions will not give primary amine?
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a)
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b)
0%
c)
0%
d)
Explanation
Isocyanides yield secondary amines on reduction Answer : (b)
Q.22
Aniline reacts with NaNO2 and HCl at room temperature to give
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a) Phenol
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b) Nitroaniline
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c) Diazonium chloride
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d) Chloroaniline
Explanation
Answer : (c)
Q.23
Which is formed when (CH3)4NOH is heated?
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a) (C2H5)2NH
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b) (CH3)3N
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c) CH3NH2
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d) C2H5NH2
Explanation
Answer : (b)
Q.24
Tautomerism will be exibited by
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a) (CH3)2NH
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b) RCH2NO2
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c) (CH3)3CNO
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d) R3CNO2
Explanation
Nitro compounds containing α-hydrogen atom show aci-nitro tautomerism Answer : (b)
Q.25
Which one of the following is the strongest base in aqueous solution? [ AIEEE 2007]
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a) Methyl amine
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b) Trimethyl amine
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c) Aniline
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d) Dimethyl amine
Explanation
The increasing order of basicity of the given compoundss is (CH3)2NH > CH3NH2 >(CH3)3 > C6H5NH2 Answer : (d)
Q.26
Which one of the following compound when heated with KOH and primary amines gives carbylamine test? [ Roorkee 1990]
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a) CHCl3
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b) CH3Cl
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c) CCl4
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d) CH3NC
Explanation
carbylamine reaction, in this reaction, the analyte is heated with alcoholic potassium hydroxide and chloroform. If a primary amine is present, the isocyanide (carbylamine) is formed which are foul smelling substances The carbylamine test does not give a positive reaction with secondary and tertiary amines. Answer : (a)
Q.27
Treatment of ammonia with excess of ethyl iodide will yield
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a) Triethyl amine
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b) Tetraethylammonium iodide
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c) Diethyl amine
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d) Ethyl amine
Explanation
Answer : (c)
Q.28
ion Q26) X in the following reaction is .... ... [ DEC 2006]
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a)
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b)
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c)
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d)
Explanation
Answer : (b)
Q.29
Tertiary nitro compounds canot show tautomerism because ... [ KCET 1993]
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a) they are very stable
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b) isomerises to give sec.nitro compounds
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c) do not have labile H-atom
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d) they are highly reactive
Explanation
Answer : (c)
Q.30
Hinsberg's reagent is used to distinguish ... ... [ DEC 2005]
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a) Amines
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b) Alcohols
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c) Acids
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d) Amides
Explanation
Hinsber's reagent (C6H5SO2Cl) Answer : (a)
0 h : 0 m : 1 s
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