The product C in the following sequence of reactions has ________ $$\pi$$ bonds.

In the Claisen-Schmidt reaction to prepare $$351 \mathrm{~g}$$ of dibenzalacetone using $$87 \mathrm{~g}$$ of acetone, the amount of benzaldehyde required is _________ g. (Nearest integer)

Vanillin compound obtained from vanilla beans, has total sum of oxygen atoms and $$\pi$$ electrons is __________.

The product of the following reaction is P.

The number of hydroxyl groups present in the product P is ________.