What is the product of the hydrolysis of trichloromethane with $KOH$?

Which among the following metals is involved in the preparation of a Grignard reagent?

The $E_2$ product of the following reaction will be?

In a $S_N2$ substitution reaction of the type $R-Br + Cl^- \xrightarrow{DMF} R-Cl + Br^-$,which one of the following has the highest relative rate?

What is the major product of the following reaction?
$1\text{-methylcyclopentene} \xrightarrow[\text{Peroxide}]{\text{HBr}} ?$

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