(a)
Cl OH
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$CH_{3} - C - CH_{3}\overset{\ \ Hydrolysis\ \ \ }{\rightarrow}CH_{3} - C - CH_{3}$
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Cl OH
2,2-dichloro propane unstable
$\overset{\rightarrow}{{- H}_{2}O\ \ \ \ \ }CH_{3} - C - CH_{3}$
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \parallel$
O
acetone