- A$1{s^2},$ $2{s^2}2{p^2}$
- ✓$2{s^2}2{p^6}$
- C$1{s^2},$ $2{s^2}$
- D$1{s^2}$
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True statement about sequence on the basis of assumption that $R$ contains $3$ different groups is
$\mathop R\limits^{\delta \oplus } \,\mathop {Br}\limits^{\delta \,\Theta } \, \rightleftharpoons $ $\mathop {\boxed{{R^ \oplus }B{r^\Theta }}}\limits_{(a)} \,\,\, \rightleftharpoons \,$$\,\mathop {\boxed{{R^ \oplus }}\,\boxed{B{r^\Theta }}\,}\limits_{(b)} \,\, \rightleftharpoons $ ${\boxed{{R^ \oplus }}}$ $ \rightleftharpoons $ $\mathop {\,\boxed{B{r^\Theta }}\,}\limits_{(c)} \,$

$2$ $[image]$ + $\begin{array}{*{20}{c}}
{O\,\,\,\,\,\,} \\
{||\,\,\,\,\,\,} \\
{H - C - CC{l_3}}
\end{array}$ $\xrightarrow{{{H_2}S{O_4}}}$
The major product formed is
$X\xrightarrow{{{\text{Bromination}}}}Y\xrightarrow{{NaN{O_2} + HCl}}Z\mathop {\xrightarrow{{{\text{Boiling}}}}}\limits_{{C_2}{H_5}OH} {\text{Tribromobenzene}}$