15
MCQ (Single Correct Answer)
The gas evolved when methylamine reacts with nitrous acid is ........... .
A
$\mathrm{NH}_3$
B
$\mathrm{N}_2$
C
$\mathrm{H}_2$
D
$\mathrm{C}_2 \mathrm{H}_6$
16
MCQ (Single Correct Answer)
In the nitration of benzene using a mixture of conc. $\mathrm{H}_2 \mathrm{SO}_4$ and conc. $\mathrm{HNO}_3$, the species which initiates the reaction is ............. .
A
$\mathrm{NO}_2$
B
$\mathrm{NO}^{+}$
C
$\mathrm{NO}_2^{+}$
D
$\mathrm{NO}_2^{-}$
17
MCQ (Single Correct Answer)
Reduction of aromatic nitro compounds using Fe and HCl gives .............. .
A
aromatic oxime
B
aromatic hydrocarbon
C
aromatic primary amine
D
aromatic amide
18
MCQ (Single Correct Answer)
The most reactive amine towards dilute hydrochloric acid is ............. .
A
$\mathrm{CH}_3-\mathrm{NH}_2$
B
C
D
19
MCQ (Single Correct Answer)
Acid anhydrides on reaction with primary amines give ............ .
A
amide
B
imide
C
secondary amine
D
imine