Decreasing order of reactivity of the following compounds in the Williamson's ether synthesis is

(II) $\mathrm{Cl}-\mathrm{CH}_2-\mathrm{CH}=\mathrm{CH}_2$

(III) $\mathrm{Cl}-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{CH}_3$

$$ \text { Identify } X \text { and } Y \text { in the reactions, given below } $$

A primary alcohol was reacted with pyridinium chlorochromate (PCC), which resulted in a product $P$. The product $P$ on treatment with ammonical silver nitrate solution produces

The major product of the following reactions