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NEET Chemistry MCQ
Compounds Containing Nitrogen Mcq Neet Chemistry
Quiz 5
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Q.1
Attacking species in nitration of benzene, which of the following is intermediate?
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c) C6H5NH - NHC6H5
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a) C6H5 - N = N - C6H5
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b) C6H5 - N = O
0%
d)
Explanation
In the reduction of nitrobenzene, nitrosobenzene (C6H5-N=O) and phenyl hydroxylamines (C6H5-NHOH) are obtained as intermediate depending upon the pH of reaction medium Answer : (b)
Q.2
on Q123) The IUPAC name of following compound is
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a) 2-cyno-3methyl hexane
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b) 2,4-dimentyl pentane nitrile
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c) 2-dimethyl-4-cyanopentane
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d) 2-cyno-3-methyl hexane
Explanation
Answer : (b)
Q.3
Aniline when treated with conc. HNO3 gives
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a) Nitrobenzene
0%
b) p-phenylenediamine
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c) p-benzoquinone
0%
d) m-nitroaniline
Explanation
In acidic medium aniline gets protonated to anilinium ion which is meta-directing Answer : (d)
Q.4
In the nitration of benzene with a mixture of concentrated nitric acid and concentrated sulphuric acid, the active species involved is
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a) Nitrate ion
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b) Nitrite ion
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c) Nitronium ion
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d) Nitric oxide
Explanation
HNO3 + 2H2SO4 → NO2+ + H3O+ + 2HSO4- NO2+ is nitronium ion Answer : (c)
Q.5
on Q126) Identify X in the sequence.
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a) (CH3)3N
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b) CH3-CH2-CH2-NH2
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c) CH3-NH-CH2-CH3
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d) none of the above
Explanation
C3H8O is alcohol and C3H6O2 is acid. Thus C3H9N is primary amine Answer : (b)
Q.6
The correct order of increasing basicity in aqueous solution is
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a) C6H5NH2 < NH3 < C6H5NH2 <(C2H5)3N<(C2H5)2NH
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b)NH3 < C6H5NH2 < (C2H5)2NH < C2H5NH2 < (C2H5)3N
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c) C6H5NH2 < NH3 < (C2H5)3N < C6H5NH2 < (C2H5)2NH
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d) None of the above
Explanation
Aromatic amines are far less basic than ammonia and alkyl amines are more basic than ammonia. Basic strength of ethylamine in aqueous solution follows the order 2° > 3° 1°. Answer : (a)
Q.7
Which of the following statement about primary amines is false?
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a) Alkyamines are stronger base than aryl amines
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b) Alkylamines reacts with nitrous acid to produce alcohols
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c) Arylamines react with nitrous acid to produce phenols
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d) Alkylamines are stronger base than ammonia
Explanation
Answer : (b)
Q.8
Reaction of aniline with benzaldehyde is a .... .... reaction
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a) Addition
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b) Substitution
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c) Condensation
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d) None of these
Explanation
Answer : (c)
Q.9
Amongst the following, the most basic compound is
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a) Aniline
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b) Acetanilide
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c) Benzylamine
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d) p-nitroaniline
Explanation
Due to +I effect of benzyl group. Answer : (c)
Q.10
on Q131)What is A infollowing reaction
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a) RCONH2
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b) RCOOH
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c) RNH2
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d) R-NCO
Explanation
Answer : (d)
Q.11
Reduction of nitrobenzene in the presence of Zn/NH4Cl gives
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a) Aniline
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b) Azobenzene
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c) Hydraazobenzene
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d) N-phenylhydroxylamine
Explanation
Answer : (d)
Q.12
on Q133) Match the compounds in List I with the appropriate test that will be answered by each one of them in List II from the combinations shown:
I. Propyne
A. Reduces Fehling's solution
II. Ethyl benzoate
B. Forms a precipitate with AgNO
3
in ethanol
III. Acetaldehyde
C. Insoluble in water but dissolveds in aqueous NaOH solution upon heating
IV. Aniline
D. Dissolves in dilute HCl in the cold and is reprecipitated by the addition of alkali
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a) I - B, II - C, III - A, IV - D
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b) I - A, II - D, III - B, IV - C
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c) I - D, II - B, III - C, IV - A
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d) I - A, II - D, III - C , IV - B
Explanation
Answer : (a)
Q.13
The active species produced in Hofmann's bromide reaction is
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a) Br2
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b) OBr-
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c) OBr2
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d) Br-
Explanation
Answer : (b)
Q.14
Nitrosoamines ( R2N - N = O) are insoluble in water. On heating with conc. H2SO4, they give secondary amines. The reaction is called
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a) Fries reaction
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b) Perkin reaction
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c) Liebermann nitroso reaction
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d) Etard reaction
Explanation
The reaction is called Liebermann nitroso reaction Answer : (c)
Q.15
Assertion: In strongly acidic medium, aniline becomes less reactive towards electrophilic reagent Reason: - NH2 group is o- and p- directing
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a) both the assertion and reason are true and reason explains the assertion
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b) both the assertion and reason are true but reason does not explain the assertion.
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c) assertion is true but reason is false
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d) assertion is false but reason is true.
Explanation
Answer : (b)
Q.16
Dry test can be used to distingusish between
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a) Methyl amine and ethyl amine
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b) Urea and acetamide
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c) Ethyl amine and aniline
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d) Ethyl amine and acetamide
Explanation
Dye test is used to distinguish between primary aromatic amines and primary aliphatic amines Answer : (c)
Q.17
A positive carbylamine test is given by ... ...[ IIT 1999 ]
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a) N, N-dimethylaniline
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b) 2,4-dimethylaniline
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c) N-methyl-o-methylamine
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d) p-methyl benzylamine
Explanation
Carbyl amine test test is for primary amines, 2-4-dimethylamine is also primary amine but does not give test due to steric hindrance Answer : (d)
Q.18
Ketones and 1° amines react to form
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a) amides
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b) anils
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c) urea
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d) oximes
Explanation
Answer : (b)
Q.19
Acetoneoxime on catalytic hydrogenation gives [ PET (MP) 1993]
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a) 1-propanamine
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b) isopropylamine
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c) ethyl methyl amine
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d) CH4 and ethanamine
Explanation
Answer : (b)
Q.20
Aniline, chloroform and alc.KOH on heating give
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a) phenyl isocyanide
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b) phenol
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c) phenyl cyanide
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d) chlorobenzene
Explanation
It is a carbylamine reaction Answer : (a)
Q.21
Amongst the compounds given, the one that would form a brilliant coloured dye on treatment with NaNO2 in dil. HCl followed by addition to an alkaline solution of β-naphthol is [ IIT 2011]
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Aliphatic amines are stronger base than aromatic amines Answer : (a)
Q.22
A compound A has a molecular formula C7H7NO. On treatment with Br2 and KOH, A gives an amine B which gives carbylamine test, B upon diazotisation and coupling with phenol gives an azo dye. A can be
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a) C6H5NO2
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b) C6H5CONH2
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c) o-, m- and p-C6H4(NH2)CHO
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d) none of above
Explanation
Answer : (b)
Q.23
Which of the following reactions does not yield an amine?
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a) R-X + NH3 →
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b)
0%
c)
0%
d)
Explanation
R-X + NH3 → R-NH2 + HX But Answer : (c)
Q.24
on Q146) Identify X in the reaction
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Answer : (b)
Q.25
When nitrobenzene is treated with Br2 in presence of FeBr3, the major product formed in m-bromonitrobenzene. Statements which are related to obtain the m-isomer are ... [ IIT 1992]
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a) the relative electron density on meta carbon is more than that of ortho and para positions
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b) loss of aromaticity when Br+ attacks at the ortho and para positions and not at meta position
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c) easier loss of H+ to regain aromaticity from the meta position than from ortho and para positions
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d) none of the above
Explanation
The presence of m-directing groups in benzene nucleus simply decreases electron density at o- and p-, whereas no change in electron density at m-position is noticed Answer : (a)
Q.26
Benzamide on reaction with POCl3 gives ... .. [ IIT 2004]
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a) aniline
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b) chlorobenzene
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c) benzylamine
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d) benzonitrile
Explanation
Answer : (d)
Q.27
han one correct answer Q149) Using anhydrous AlCl3 as catalyst, which one of the reaction produces ethyl benzene?
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a) CH3CH2OH + C6H6
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b) CH3-CH3+ C6H6
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c) CH3CH=CH2 + C6H6
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d) CH2 = CH2+ C6H6
Explanation
Answer : (a,c)
Q.28
on Q150) In the following reaction, the product X is .... [ IIT 2007]
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a)
0%
b)
0%
c)
0%
d)
Explanation
-NH and -CO_ groups are o- and p- directing ( activating) and m-directing groups (deactivating) respectively. In such case o- (minor) and p- isomers (major) predominates Answer : (b)
Q.29
The one which is least basic is
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a) (C6H5)3N
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b) C6H5NH2
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c) NH3
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d) (C6H5)2NH
Explanation
More the number of benzene ring attached directly to nitrogen atom of amino group, less is the basic strength Answer : (a)
Q.30
Which of the following compounds does not react with NaNO2 and HCl
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a) C6H5NH2
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b) (CH3)2CHNO2
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c) C6H5OH
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d) (CH3)3CNO2
Explanation
Becasue tertiary nitrolakanes lack α-hydrogen atom Answer : (d)
0 h : 0 m : 1 s
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