Chemical Bonding and Molecular Structure — Chemistry STD 11 Science — Question

(figure) $\xrightarrow[{(2)\,Zn}]{{(1)\,{O_3}}}\mathop {\begin{array}{*{20}{c}}
  {\,\,\,\,O\,\,\,\,\,\,\,O\,\,} \\ 
  {\,||\,\,\,\,\,\,\,\,\,||} \\ 
  {H - C - C - H} 
\end{array}}\limits_{Glyoxal}  + $ $\mathop {\begin{array}{*{20}{c}}
  {\,\,\,O\,\,\,\,\,O\,\,} \\ 
  {\,||\,\,\,\,\,\,\,\,||} \\ 
  {C{H_3} - C - C - C{H_3}} 
\end{array}}\limits_{2,3 - Bu\tan edione}  + \mathop {\begin{array}{*{20}{c}}
  {\,\,\,\,\,\,O\,\,\,\,\,O} \\ 
  {\,\,\,\,\,\,||\,\,\,\,\,\,||} \\ 
  {C{H_3} - C - C - H} 
\end{array}}\limits_{Pyrualdehyde} $

[$A$] The work done on the gas is maximum when it is compressed irreversibly from ( $\mathrm{p}_2, \mathrm{~V}_2$ ) to ( $\mathrm{p}_1, \mathrm{~V}_1$ ) against constant pressure $\mathrm{pl}_1$

[$B$] The work done by the gas is less when it is expanded reversibly from $V_1$ to $V_2$ under adiabatic conditions as compared to that when expanded reversibly from $V_1$ to $V_2$ under isothermal conditions

[$C$] The change in internal energy of the gas is ($i$) zero, if it is expanded reversibly with $T_1=T_2$, and ($ii$) positive, if it is expanded reversibly under adiabatic conditions with $T_1 \neq T_2$

[$D$] If the expansion is carried out freely, it is simultaneously both isothermal as well as adiabatic