millimoles of $\mathrm{H}_{2} \mathrm{SO}_{4}=20$
milliequivalent of $\mathrm{H}_{4} \mathrm{SO}_{4}=20 \times 2=40$
Percentage of $\mathrm{N}$ in the sample $=\frac{1.4 \times 40}{2.8}=20 \%$
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(IMAGE)
$[A]$ ( $M$ and $O)$ and ( $N$ and $P$ ) are two pairs of diastereomers
$[B]$ Bromination proceeds through trans-addition in both the reactions
$[C]$ $O$ and $P$ are identical molecules
$[D]$ (M and $O)$ and ( $N$ and $P)$ are two pairs of enantiomers
