3
MCQ (Single Correct Answer)
Amongst the following, the strongest base in aqueous medium is
A
$\mathrm{CH}_3 \mathrm{NH}_2$
B
$\mathrm{NCCH}_2 \mathrm{NH}_2$
C
$\left(\mathrm{CH}_3\right)_2 \mathrm{NH}$
D
$\mathrm{C}_6 \mathrm{H}_5 \mathrm{NHCH}_3$
4
MCQ (Single Correct Answer)
Which of the following is the weakest Brosted base?
A
B
C
D
$\mathrm{CH}_3 \mathrm{NH}_2$
5
MCQ (Single Correct Answer)
Benzylamine may be alkylated as shown in the following equation?
$$\mathrm{C}_6 \mathrm{H}_5 \mathrm{CH}_2 \mathrm{NH}_2+\mathrm{R}-\mathrm{X} \longrightarrow \mathrm{C}_6 \mathrm{H}_5 \mathrm{CH}_2 \mathrm{NHR}$$
Which of the following alkyl halides is best suited for this reaction through $\mathrm{S}_{\mathrm{N}} 1$ mechanism?
A
$\mathrm{CH}_3 \mathrm{Br}$
B
$\mathrm{C}_6 \mathrm{H}_5 \mathrm{Br}$
C
$\mathrm{C}_6 \mathrm{H}_5 \mathrm{CH}_2 \mathrm{Br}$
D
$\mathrm{C}_2 \mathrm{H}_5 \mathrm{Br}$
6
MCQ (Single Correct Answer)
Which of the following reagents would not be a good choice for reducing an aryl nitro compound to an amine?
A
$\mathrm{H}_2$ (excess) / Pt
B
$\mathrm{LiAlH}_4$ in ether
C
Fe and HCl
D
Sn and HCl
7
MCQ (Single Correct Answer)
In order to prepare a $1^{\circ}$ amine from an alkyl halide with simultaneous addition of one $\mathrm{CH}_2$ group in the carbon chain, the reagent used as source of nitrogen is ............ .
A
sodium amide, $\mathrm{NaNH}_2$
B
sodium azide, $\mathrm{NaN}_3$
C
potassium cyanide, KCN
D
potassium phthalimide $\mathrm{C}_6 \mathrm{H}_4(\mathrm{CO})_2 \mathrm{NK}^{+}$