In solvolysis of $1,2$-dimethylpropyl $p$-toluenesulfonate in acetic acid at $75^\circ C$,(alkene + substitution products) will be formed by which mechanism?

An 'Assertion' $(A)$ and a 'Reason' $(R)$ are given below. Choose the correct answer from the following options.
Assertion $(A)$: Vinyl halides do not undergo nucleophilic substitution easily.
Reason $(R)$: Even though the intermediate carbocation is stabilized by loosely held $p-$ electrons,the cleavage is difficult because of strong bonding.

The following compound on hydrolysis in aqueous acetone will give:

Match the $LIST$-$I$ with $LIST$-$II$:

List-$I$ (Reaction)	List-$II$ (Mechanism)
$A$. Williamson Synthesis	$I$. Electrophilic addition
$B$. Friedel-Crafts Reaction	$II$. Free radical substitution
$C$. Bromination of vinyl benzene	$III$. Nucleophilic substitution
$D$. Chlorination of toluene in light	$IV$. Electrophilic substitution

Choose the correct answer from the options given below:

In the alkaline hydrolysis of a tertiary alkyl halide by aqueous alkali,if the concentration of the alkali is doubled,then the reaction rate:

Which of the following represents the $(R)$-enantiomer of $1$-chloro-$1$-deutero-$1$-($4$-chlorophenyl)methane?