Which one of the following has the highest boiling point?

The product $(C)$ in the following reaction sequence is:
$4-\text{Bromoethylbenzene}$ $\xrightarrow[\Delta]{Br_2} B$ $\xrightarrow{\text{aq. } KOH} C$

Given below are two statements :
Statement $I$ : $S_N2$ reactions are 'stereospecific',indicating that they result in the formation of only one stereo-isomer as the product.
Statement $II$ : $S_N1$ reactions generally result in the formation of product as racemic mixtures.
In the light of the above statements,choose the correct answer from the options given below :

The dehydrohalogenation of neopentyl bromide with alcoholic $KOH$ mainly gives

What is obtained when toluene is chlorinated in the presence of light and then heated with aqueous $NaOH$?

Identify the product formed when $2-$Bromobutane is heated with aqueous solution of sodium hydroxide.