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Q. Vicinal and geminal dihalides can be distinguished by

Haloalkanes and Haloarenes

Solution:

$\underset{\text{Vic-dihalide}}{CH_{2}ClCH_{2}Cl} \xrightarrow{KOH(aq.) }$ $\underset{\text{ethane-1-2-diol}}{CH_{2}OHCH_{2}OH}$
$\underset{\text{Gem-dihalide}}{CH_{3}CHCl_{2}} \xrightarrow{KOH(aq.) }$ $\underset{\text{ethanal}}{CH_{3}CHO}$