What is the primary product of an $S_N1$ reaction on an optically active substance?

The incorrect statement regarding chirality is :

The major product obtained in the following reaction is $C_2H_5ONa + (CH_3)_3C-Cl \rightarrow$

Elimination of bromine from $2-$bromobutane results in the formation of

An alkene $X$ $(C_4H_8)$ on reaction with $HBr$ gave $Y$ $(C_4H_9Br)$. Reaction of $Y$ with benzene in the presence of anhydrous $AlCl_3$ gave $Z$,which is resistant to oxidation with $KMnO_4-KOH$. What are $X, Y, Z$ respectively?

The compound having the longest $C-Cl$ bond is: