In $S_N1$ reaction, the alkyl halide that on hydrolysis produces a racemic mixture is

$1$-methyl ethylene oxide (propylene oxide) when treated with an excess of $HBr$ produces:

What is an alcoholic solution of $KOH$ used for?

$A$ dihalogen derivative $X$ of a three-carbon hydrocarbon reacts with alcoholic $KOH$ to give another hydrocarbon,which gives a red precipitate with ammoniacal $Cu_2Cl_2$. Reaction of $X$ with aqueous $KOH$ gives an aldehyde. The compound $X$ is .......

Which of the following alkyl halides is most reactive towards the $S_{N}1$ mechanism?

The relative reactivity of
$(I)$ Benzyl chloride
$(II)$ $p$-methoxy benzyl chloride
$(III)$ $p$-Nitrobenzyl chloride
Towards $S_N^1$ reaction follows the order