Two moles of benzaldehyde and one mole of acetone under alkaline conditions using aqueous $$\mathrm{NaOH}$$ after heating gives $$x$$ as the major product. The number of $$\pi$$ bonds in the product $$x$$ is ______.

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 __________.