- A$CO_3^{-2}$
- B$SO_4^{-2}$
- C$CS_2$
- ✓$NH_3$

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$(A) \,2p_y +2p_y \to \pi-$ 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
$(1)$ Pentose $(2)$ Pentulose $(3)$ Hexulose $(4)$ Hexose
$(5)$ Aldose $(6)$ Ketose $(7)$ Pyranose $(8)$ Furanose
$\begin{array}{*{20}{c}}
{{H_2}N - CH - CH - CHO} \\
{\,|\,\,\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,} \\
{HOOC\,\,\,\,\,\,\,\,\,\,COOH\,\,\,\,\,}
\end{array}$
$C (diamond) + O_2 \rightarrow CO_2(g)\ ;\Delta H =\ -97.6\ kcal$
$C (graphite) + O_2 \rightarrow CO_2(g)\ ;\Delta H =\ -94.3\ kcal$
The heat change for the conversion of $1\ g$ of $C (diamond) \rightarrow C (graphite)$ is
$C{H_3}C{H_2}COOH\xrightarrow{{PC{l_3}}}I\xrightarrow[{AlC{l_3}}]{{{C_6}{H_6}}}II\xrightarrow[{base,heat}]{{N{H_2}N{H_2}}}III$ is