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NEET Chemistry MCQ
Compounds Containing Nitrogen Mcq Neet Chemistry
Quiz 4
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Q.1
The reduction of CH3CN to CH3CH2NH2 is called
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a) Mendius reduction
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b) Hofmann's reduction
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c) Rosnmunds's reduction
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d) Clemmensen's reduction
Explanation
The converson of -CN to -CH2NH2 by catalytic reduction is called Mendius reaction Answer : (a)
Q.2
The reduction of nitrobenzene with zinc and alkali results in the formation of
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a) Hydrazobenzene
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b) Phenylhydroxylamine
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c) Aniline
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d) Nitrobenzene
Explanation
Answer : (a)
Q.3
tion: Nitromethane and acenitromethane are tautomers to each other Reason: Migration of H atom from α-C atom to electronegative atom which is bonded with multiple bond develops this phenomenon
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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 : (a)
Q.4
Aniline reacts with phosgene and KOH to form
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Answer : (b)
Q.5
Which of the following compounds gives dye test?
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a) Methyl amine
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b) Ethyl amine
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c) Aniline
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d) Diphenyl amine
Explanation
Aromatic primary amines give dye test Answer : (c)
Q.6
Nitrobenzne on reduction with Al-Hg and water gives
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a) azoxy benzene
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b) azobenzene
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c) aniline
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d) phenylhydroxylamine
Explanation
Answer : (d)
Q.7
Indicate which nitrogen compound amongst the following would undergo Hofmann reaction (i.e. reaction with Br2 and strong KOH) to furnish the primary amine (R - NH2)
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a) RCOONH4
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b) R - CO - NHOH
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c) RCONHCH3
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d) RCONH2
Explanation
Acid amides RCONH2 undergo Hoffmann reaction to furnish 1° amine Answer : (d)
Q.8
than one correct answers Q98) in C4H11N (A) + HNO2 → C4H10O (3° alcohol) Thus (A) will give
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a) Carbylamine reaction
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b) Hoffmann mustard oil reaction
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c) diazotisation
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d) none is correct
Explanation
Answer : (a,c)
Q.9
ion Q99) Match the compounds in List I with their nature from List II, as seen in aqueous medium from the combinations shown
List I
List II
I. Acetamide
A. Acidic
II. Benzonitrile
B. Basic
III. Triethylamine
C. Neytral
IV. Phenol
- - - -
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a) I - C; II - C ; III - B; IV -A
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b) I - B; II - C; III - C; IV - A
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c) I - C; II - B; III - B ; IV - C
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d) I -A ; II - A; III - C; IV - B
Explanation
Acetamide and benzonitrile are neutral, triethylamine is basic and phenol is acidic Answer : (a)
Q.10
on Q100) In the compound given below the correct order of acidic nature of the position (X), (Y) and (Z) is ... [ IIT 2004]
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a) Z > X > Y
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b) X > Y > Z
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c) X > Z > Y
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d) Y > X > Z
Explanation
The order for acedic nature depends upon the ease to lose H+ ion. -COOH is resonance stabilized and thus lose H+ earliest. Also NH3+ near to -COOH release H+ more easily due to electron withdrawing nature of -COOH than NH3+ more than NH4+ far away from -COOH Answer : (b)
Q.11
The compound that will react most readily with NaOH to form methanol is
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a) (CH3)3CCl
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b) CH3OCH3
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c) (CH3)4N+I-
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d) (CH3)3S+I-
Explanation
(CH3)4N+I- + NaOH → CH3OH + (CH3)3N + NaI Answer : (c)
Q.12
on Q103) What is the end product in the following sequence of operations?
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a) Acetamide
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b) Ethyl amine
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c) Ethyl cyanide
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d) Methyl amine
Explanation
Product A: C2H5OH ( ethyl alcohol) Product B : C2H5Cl ( ethyl chloride) Product C : C2H5NH2 { ethyl amine) Answer : (b)
Q.13
ion: Aniline does not undergo Friedel-Craft reaction Reason: -NH2group of aniline reacts with AlCl3 to give acid-base reaction
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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 : (a)
Q.14
C3H9N represents
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a) Primary amine
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b) Secondary amine
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c) Tertiary amine
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d) All
Explanation
Answer : (d)
Q.15
The basic character of methylamines in vapour phase is
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a) 3° > 2° > 1° > NH3
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b) 2° > 3° > 1° > NH3
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c) 1° > 2° > 3° > NH3
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d) none of these
Explanation
In vapour phase the basic character of methylamines is 3° > 2° > 1° > NH3 This is due to less acidic character in conjugate acids of amines becuase of +ve IE of methyl group which disperse +ve charge on N-atom more effectively in 3° ion In case of solution phase steric hinderance or solvation effect play role to give the basic order 2° > 1° > 3° > NH3 Answer : (a)
Q.16
on Q107) Choose the correct statement from the ones given below for two anilium in .. [ IIT 1993]
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a) II is not acceptable cannonical structure because carbonium ions are less stable than ammonium ions
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b) II is not an acceptable canonical structure because it is non-aromatic
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c) II is not an acceptable cannonical structure because the nitrogen has 10 valence electrons
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d) II is an acceptable cannociacal structure
Explanation
N cannot have more than 8 elements in its valence shell Answer : (c)
Q.17
Gabriel phthalimide reaction is used for prepartion of
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a) Tertiary amines
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b) Secondary amines
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c) Primary aliphatic amines
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d) Primary aromatic amines
Explanation
Gabriel phthalimide reaction is used for preparation of primary aliphatic amines Answer : (c)
Q.18
han one correct answers Q109) Nitrobenene on eletolytic reduction gives(s)
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a) p-aminophenol
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b) phenyl hydroxylamine
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c) hydrazobenzene
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d) aniline
Explanation
Answer : (b,c,d)
Q.19
An organic compound having molecular ass 60 is found to contain C=20%, H = 6.67% and N = 46.67% while rest is oxygen. On heating it gives NH3 alongwith a solid residue. The solid residue gives violet colour with alkaline copper sulphate solution. The compound is ... .. [ AIEEE 2005]
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a) CH3NCO
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b) CH3CONH2
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c) (NH2)2CO
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d) CH3CH2CONH2
Explanation
Element
%age
No.of atoms
Relative no.
C
20.00
1.67
1
H
6.67
6.67
4
N
46.67
3.33
2
O
26.66
1.67
1
The empirical formula is CH4N2O Empirical mass = 12 +(4 × 1) + (2 × 14) + 16 = 60 Empirical mass = molecular mass ∴ Molecular formula = CH4N2O On heating compound it gives NH3 gives solid residue, thus compound must be H2NCONH2 Biuret gives violet colour with alkaline copper sulphate solution Answer : (c)
Q.20
on Q111) The product A formed in the reaction is
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a)
0%
b)
0%
c)
0%
d)
Explanation
This is thorpe nitrile condensation involving only α-H atom of nitrile due to strong attraction nature of CN group Answer : (c)
Q.21
Nitrobenzene on electrolytic reduction in strongly acidic medium gives
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a) Nitrosobenzene
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b) m-Nitoaniline
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c) p-Aminophenol
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d) Aniline
Explanation
Answer : (c)
Q.22
Reaction of cyclohexanone with dimethyl amine in the presence of catalytic amount of an acid forms a compound if water during the reaction is continuously removed. The compound formed is generally known as .... [ AIEEE 2005]
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a) Schiff's base
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b) an enamine
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c) an imine
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d) an amine
Explanation
Answer : (b)
Q.23
Dipole moment of p-nitroaniline, when compared to nitrobenzene (X) and aniline (Y) will be
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a) greater than (X) and (Y)
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b) smaller than (X) and (Y)
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c) greater than (X) but smaller than (Y)
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d) equal to zero
Explanation
µ1 and µ2 both for NO2 (electron withdrawing) and NH2 (electron releasing) group act in same direction Answer : (a)
Q.24
Which of the following compounds cannot be identified by carbylamine test
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a) C6H5-NH-C6H5
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b) CHCl3
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c) CH3CH2NH2
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d) C6H5NH2
Explanation
Secondary amines do not respond to carbylamine reaction Answer : (a)
Q.25
The reagent used for conservation of benzene diazonium chloride to benzene is
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a) Na2SnO2 + NaOH
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b) C2H5OH
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c) H3PO2
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d) all of these
Explanation
-N2Cl is reduced to H by either of these reducing agents Answer : (d)
Q.26
Nitrobenzene can be prepared from benzene by using a mixture of conc. HNO3 and conc H2SOIn the nitrating mixture HNO3 acts as a .... [ IIT 1997]
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a) base
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b) acid
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c) reducing agent
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d) Catalyst
Explanation
HNO3 accepts proton from H2SO4 HNO3+ H+ → H2O + NO2+ Answer : (a)
Q.27
A primary amine heated with CS2 in presence of excess of HgCl2 gives isothiocyanate. The reaction is called ... [ CET Haryana 1996]
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a) Hoffmann's bromamide reaction
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b) Hoffmann's mustard oil reaction
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c) Perkin's condensation
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d) Hoffmann's elimination
Explanation
Answer : (b)
Q.28
p-chloroaniline and anilium hydrochloride can be distinguished by
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a) AgNO3
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b) carbylamine test
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c) P2O5
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d) Sandmeyer's reaction
Explanation
anilium hydrochloride gives white ppt. with AgNO3 Answer : (a)
Q.29
On reduction, secondary amine is given by
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a) Nitrobenzene
0%
b) Methyl cyanide
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c) Nitroethane
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d) Methyl isocyanide
Explanation
On reduction CH3-NC → CH3 - NH - CH3 ( Diethyl amine, 2°) Answer : (d)
Q.30
Hinsberg reagent is
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a) C6H5NO
0%
b) C6H5N2Cl
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c) C6H5SO3H
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d) C6H5SO2Cl
Explanation
Answer : (d)
0 h : 0 m : 1 s
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