MCQ
Glyoxal $(CHOCHO)$ on being heated with concentrated $NaOH$ forms.
- A$HOOC COOH$
- B$HOCH_2 -CH_2OH$
- C$CHOCOOH$
- ✓$CH_2OH -COONa$
$-\,CHO$ group oxidise in acidic group and another
$-\, CHO$ group of same comp. is reduced in alcohol.
$\begin{array}{*{20}{c}}
{C{H_2} - C - O - Na} \\
{\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{OH\,\,\,\,\,\,\,\,O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}
\end{array}\,$
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Reason : The reaction involves syn-addition of bromine.
(Given atomic number: $\mathrm{Sc}=21, \mathrm{Ti}=22, \mathrm{~V}=23$, $\mathrm{Cr}=24, \mathrm{Mn}=25$ and $\mathrm{Zn}=30)$