Which one is liquid at room temperature?

Identify the correct reactivity order for $E_2$ reaction with alc. $KOH$ for the following compounds:
$(i)$ $8$-chlorocycloocta-$1,3,5$-triene
(ii) $3$-chlorocyclohexa-$1,4$-diene
(iii) $3$-chlorocyclobutene

The reaction:
$CH_3CH_2I + KOH_{(aq)} \to CH_3CH_2OH + KI$
is classified as :

An organic compound $X$ $(C_7H_7Cl)$ when reacted with $KCN$ in $C_2H_5OH$ gives a major product $Y$. $Z$ is formed when $Y$ is reduced with $LiAlH_4$. What are $Y$ and $Z$?

Select the reagent that will yield the greater amount of substitution on reaction with $CH_3CH_2Br$.

The major product of the following reaction,if it occurs by $S_N2$ mechanism is :