The compound with molecular formula $\mathrm{C}_6 \mathrm{H}_6$, which gives only one monobromo derivative and takes up four moles of hydrogen per mole for complete hydrogenation has _________ $\pi$ electrons.

Major product B of the following reaction has ________ $$\pi$$-bond.

The major product of the following reaction is P.

$$\mathrm{CH}_3 \mathrm{C}\equiv\mathrm{C}-\mathrm{CH}_3$$ $$\xrightarrow[\substack{\text { (ii) dil. } \mathrm{KMnO}_4 \\ 273 \mathrm{~K}}]{\text { (i) } \mathrm{Na} \text { /liq. } \mathrm{NH}_3}$$ 'P'

Number of oxygen atoms present in product '$$\mathrm{P}$$' is _______. (nearest integer)

The major products from the following reaction sequence are product A and product B.

The total sum of $$\pi$$ electrons in product A and product B are __________ (nearest integer)