The rate of $S_{N}2$ reaction is:

In the reaction,$2 A + \text{dry silver oxide} \xrightarrow{\Delta} \text{ether} + 2 \operatorname{Ag} X$,$A$ is a/an

The compound which undergoes $S_{N^1}$ reaction most rapidly is

Among the following pairs of reactions,in which pair is the second reaction more reactive than the first in an $S_{N^1}$ reaction?

The correct order of boiling points of alkyl halides is:

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$ :
Assertion $(A)$ : $S_N2$ reaction of $C_6H_5CH_2Br$ occurs more readily than the $S_N2$ reaction of $CH_3CH_2Br$.
Reason $(R)$ : The partially bonded unhybridized $p$-orbital that develops in the trigonal bipyramidal transition state is stabilized by conjugation with the phenyl ring.
In the light of the above statements,choose the most appropriate answer from the options given below: