One of the products of the following reaction is $P$. Structure of $P$ is

$A$ mixture of benzaldehyde and formaldehyde on heating with aqueous $NaOH$ solution gives :-

In the scheme given below,the total number of intra molecular aldol condensation products formed from '$Y$' is

What is the product of the following reaction?

Identify the product $Y$ in the following reaction sequence:
$C_6H_6 + CH_3CH_2CH_2Cl$ $\xrightarrow{AlCl_3} X$ $\xrightarrow{KMnO_4} Y$

Propyne was subjected to a reaction with $HgSO_4/dil. H_2SO_4$,which resulted in a product $P$. The product $P$ was heated with $Ba(OH)_2$ to give the product $Q$. The molecular formula of the product $Q$ is