Product $(P)$ is

With which of the following will $HBr$ react the fastest?

In which of the following reactions will a resonance-stabilized product be formed?

Write the mechanism of the acid dehydration of ethanol to yield ethene.

Consider the following reactions:
$X + HCl \xrightarrow{\text{Anhydrous } AlCl_3} C_2H_5Cl$
$Y \xrightarrow{\text{Anhydrous } ZnCl_2 / HCl} C_2H_5Cl$
$Y$ can be converted to $X$ on heating with which of the following reagents?

Alcohols are comparatively more soluble in water than hydrocarbons of comparable molecular masses. Explain this fact.