The reaction of $C_6H_5CH=CHCH_3$ with $HBr$ produces

An alkyl halide may be converted into an alcohol by

What is dehydrohalogenation?

What is formed when toluene reacts with chlorine in the presence of light?

Given below are two statements:
Statement $I$: The conversion $CH_3-CH_2-CH_2-CH_2-Cl \xrightarrow{OH^{-}} CH_3-CH_2-CH_2-CH_2-OH + Cl^{-}$ proceeds well in a less polar medium.
Statement $II$: The conversion $(CH_3)_3C-Cl \xrightarrow{OH^{-}} (CH_3)_3C-OH + Cl^{-}$ proceeds well in a more polar medium.
In the light of the above statements,choose the correct answer from the options given below.

Given below are two statements:
Statement $I$ : $C_2H_5OH$ and $AgCN$ both can generate nucleophile.
Statement $II$ : $KCN$ and $AgCN$ both will generate nitrile nucleophile with all reaction conditions.
Choose the most appropriate option :