What is obtained by the reaction of methyl formate with excess $CH_3MgI$ followed by hydrolysis?

An organic compound $X$ on treatment with $PCC$ in dichloromethane gives the compound $Y$. Compound $Y$ reacts with $I_{2}$ and alkali to form a yellow precipitate of triiodomethane. The compound $X$ is

Which among the following has the lowest boiling point?

The reaction of $4-(\text{aminomethyl})\text{cyclohexylmethanol}$ with acetic anhydride $(Ac_2O)$ proceeds in two steps to form $P$ and $Q$. Identify $P$ and $Q$ respectively.

Write the reactions for the conversion of methanol into ethanol,propan-$2$-ol,and $2$-methylpropan-$2$-ol.

Which of the following reactions takes place when tertiary butanol is passed over heated copper at $573 \ K$?