$3 \ mol$ of ethanol reacts with $1 \ mol$ of phosphorus tribromide to give $3 \ mol$ of bromoethane and $1 \ mol$ of $X$. What is $X$?

The product$(s)$ not obtained in the following reaction is:

Which of the following compounds is most reactive toward acid-catalyzed dehydration?

Explain the intermolecular hydrogen bonding in alcohols and phenols and its effect on their physical properties.

Compound $A$ of molecular formula $C_4H_{10}O$ on treatment with Lucas reagent at room temperature gives compound $B$. When compound $B$ is heated with alcoholic $KOH$,it gives isobutene. Compound $A$ and $B$ are respectively:

Nitroglycerine is