$(a)\;2.0R\qquad(b)\;1.5R\qquad(c)\;2.5R\qquad(d)\;0$

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Let P , V be the pressure and Volume of gas at temperature T

$P_1V_1 =RT$

$P_2(V_1+dv) = R(T + 1)$

$\therefore P_2 = RT+R$

Since ($\large\frac{P_2}{V_1 + dv} = 1$)

$\Rightarrow 2(\large\frac{\delta P_2}{\delta T})_v = R$

$\Rightarrow (\large\frac{\delta P_2}{\delta T}) = \large\frac{R}{2}$

Since, $C = C_v + \large\frac{\delta P}{\delta T} $

$= \large\frac{3R}{2} + \large\frac{R}{2} $

= 2R

Hence answer is (a)

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