8.1. Organic chemistry Nomenclature of organic compounds — Chemistry STD 11 Science — Question

$\begin{matrix}
   O  \\
   ||  \\
   H-C-H,  \\
\end{matrix}\begin{matrix}
   O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O\,\,\,\,\,\,\,O\,\,\,\,  \\
   ||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||\,\,\,\,\,\,\,\,\,||\,\,\,\,\,  \\
   H-C-C{{H}_{2}}-C-C-C{{H}_{3}},  \\
\end{matrix}\begin{matrix}
   \,\,\,\,\,O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O  \\
   \,\,\,\,\,\,||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||  \\
   C{{H}_{3}}-C-C{{H}_{2}}-C-H  \\
\end{matrix}$

aalkene $(A)$ will be  ?

$C_{(graphite)} +O_2(g) \rightarrow CO_2(g)\,;$

$\Delta _rH^o=-395.5 \, kJ\,mol^{-1}$

$H_2 (g) + \frac{1}{2} O_2 (g) \rightarrow H_2O(l)\,;$   $\Delta _rH^o  =-285.8\, kJ\, mol^{-1}$

$CO_2(g) + 2H_2O(l) \rightarrow CH_4(g) + 2O_2(g)\,;$

$\Delta _rH^o  = + 890.3\, kJ\, mol^{-1}$

Based on the above thermochemical equations, the value of, $\Delta _rH^o $ at $298\, K$ for the reaction

$C_{(graphite)} + 2H_2(g) \rightarrow CH_4(g) $ will be for $\Delta_{r} H^{\circ}$ ........... $kJ \,mol^{-1}$

Which is correct statement if $\mathrm{N}_2$ is added at equilibrium condition?

$(A) \,2p_y +2p_y \to \pi-$ Bond formation

$(B) \,2p_x + 2p_x \to \sigma-$ Bond formation

$(C)\, 3d_{xy} + 3dp_{xy} \to \pi$ -Bond formation

$(D)\, 2s + 2p_y \to \pi-$ Bond formation

$(E)\, 3d_{xy} + 3d_{xy} \to \delta -$ Bond formation

$(F)\, 2p_s + 2p_s \to \sigma-$ Bond formation