The reaction $(CH_3)_3C - Br + H_2O \rightarrow (CH_3)_3C - OH + HBr$ is an example of which type of reaction?

What is the major product of the following reaction?
$1\text{-methylcyclohexene} \xrightarrow{Br_2, H_2O} ?$

Assertion $(A)$: $S_N1$ hydrolysis of optically active $2-$bromooctane results in the formation of $(\pm)-$octan$-2-$ol.
Reason $(R)$: The reaction proceeds through a planar carbocation which can be attacked by the nucleophile from either side.
The correct answer is

Which among the following is most common in alkyl halides?

The major product of the following reaction is:

Which one of the following compounds is most reactive towards $S_N1$ reaction?