Question
Which of the following conformations will be the most stable ?

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$(a)$ $U$ and $H$ each depends only on temperature
$(b)$ Compressibility factor $z$ is not equal to $1$
$(c)$ $C _{ P , m }- C _{ V , m }= R$
$(d)$ $d U = C _{ V } d T$ for any process
(Given : Molar Mass $\mathrm{Na}: 23$ and $\mathrm{Cl}: 35.5 \mathrm{gmol}^{-1}$ )