The heat of combustion of ethanol into carbon dioxide and water is $-327$ Kcal at constant pressure. The heat evolved (in cal) at constant volume at $27° \mathrm{C}$ (if all gases behave ideally) is $\left(\mathrm{R}=2 \mathrm{cal} {\mathrm{mol}}^{-1}{\mathrm{K}}^{-1}\right)$________

The internal energy change (in $\mathrm{J}$) when $90 \mathrm{g}$ of water undergoes complete evaporation at $100°\mathrm{C}$ is ..............

(Given : ${\mathrm{\Delta H}}_{\mathrm{vap}}$ for water at $373 \mathrm{K}=41 \mathrm{kJ}/\mathrm{mol}$, $\mathrm{R}=8.314 {\mathrm{JK}}^{-1} {\mathrm{mol}}^{-1}$)

The combination of plots which does not represent isothermal expansion of an ideal gas is

$\left(\mathrm{A}\right)$

$\left(\mathrm{B}\right)$

$\left(\mathrm{C}\right)$

$\left(\mathrm{D}\right)$