Which of the following will have an enantiomer?

$1,2-dichlorocyclopentane$ $\xrightarrow{1 \text{ equivalent } Mg, \text{ ether}} X$ $\xrightarrow{D_2O} Y;$
$Y$ is:

Identify the major product $X$ in the following reaction: $CH_3-CH_2-CHF-CH_3 \xrightarrow[\Delta]{alc. KOH} X$ (Major)

Which of the following reactions leads to the formation of chloretone?

Which of the following compounds will undergo racemisation when hydrolysed by an aqueous $KOH$ solution?
$(i)$ $C_6H_5CH_2Cl$
$(ii)$ $CH_3CH_2CH_2Cl$
$(iii)$ $(CH_3)_2CHCH_2Cl$
$(iv)$ $CH_3CH(Cl)C_2H_5$

Acetone is mixed with bleaching powder to give