An alcoholic solution of $KOH$ is a specific reagent for which of the following reactions?

In the following sequence of reactions, the major products $B$ and $C$ respectively are:

An alkyl halide may be converted into an alcohol by

Compare the rate of reaction with $AgNO_3$ for the following compounds:

Ethyl orthoformate is formed by heating which of the following compounds with sodium ethoxide?

The decreasing order of reactivity towards dehydrohalogenation $(E_1)$ reaction of the following compounds is:
$(A)$ $CH_3CH_2CH_2CH_2Cl$
$(B)$ $CH_2=CHCH_2CH_2Cl$
$(C)$ $CH_3CH_2CHClCH_3$
$(D)$ $CH_2=CHCHClCH_3$