$NO_2^+ \to NO_2 \to NO_2^-$
- AIncrease of $N-O$ bond order
- ✓Decrease of $O-N-O$ bond angle
- CDecrease of $N-O$ bond length
- DAll of the above
$NO_2^+ \to NO_2 \to NO_2^-$
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$\mathop {\begin{array}{*{20}{c}}
{{\mkern 1mu} {\mkern 1mu} Ph}\\
|\\
{C{H_3} - C - OH}\\
|\\
{{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_2} - C{H_3}{\mkern 1mu} {\mkern 1mu} }
\end{array}}\limits_{{\rm{'D'}}} $ $\xrightarrow{{HI}}$ products
If the configuration of substrate is $D$, then configuration of products will be


$\begin{array}{*{20}{c}} {C{H_2}OH} \\ {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ {C{H_2}OH} \end{array}$ $+$ oxalic acid $\xrightarrow{{{{210}^o}C}}$ $\quad\quad X$
$\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad$(major product)