$ \Delta \mathrm{U}=\mathrm{Q}+\mathrm{W}, $
$ \Delta \mathrm{U}=0: \text { Process is isothermal } $
$ \mathrm{Q}=-\mathrm{W} $
$ \mathrm{W}=-\mathrm{P}_{\text {ext }} \Delta \mathrm{V}: \text { Irreversible } $
$ =-80 \times 10^3(45-30) \times 10^{-3} $
$ =-1200 \mathrm{~J}$
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$\begin{array}{*{20}{c}}
{C{H_3}C{H_2}CH - C{H_2}} \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|} \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,Br\,\,\,\,\,\,\,\,\,Br\,\,}
\end{array}\xrightarrow[\begin{subarray}{l}
(ii)\,NaN{H_2} \\
in\,liq.\,N{H_3}
\end{subarray} ]{{(i)\,KOH\,alc.}}$
$(a)\,\,B\,\,\,\,\,\,\,\,\,\,(b)\,\,Mg\,\,\,\,\,\,\,\,\,\,\,\,(c)\,\,Li\,\,\,\,\,\,\,\,\,\,\,\,(d)\,\,Al\,\,\,\,\,\,\,\,\,\,\,(e)\,\,K$
