Identify product $$\mathrm{B}$$ in the following reaction.

If $$0.15 \mathrm{~m}$$ aqueous solution of KCI freezes at $$-0.511^{\circ} \mathrm{C}$$, calculate van't Hoff factor of KCI (cryoscopic constant of water is $$1.86 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1})$$

Which among the following is NOT the feature of reversible process?

Which from following functional groups is at the lowest order to decide principal functional group in polyfunctional compound?