Considering ethene molecule,which of the foll | vedclass

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(A) $I$. The $C-C$ sigma bond in ethene $(CH_2=CH_2)$ is formed by the head-on overlap of $sp^2$ hybrid orbitals of two carbon atoms. This is correct.

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$I, II, III$

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(A) $I$. The $C-C$ sigma bond in ethene $(CH_2=CH_2)$ is formed by the head-on overlap of $sp^2$ hybrid orbitals of two carbon atoms. This is correct.$II$. The $C-H$ sigma bond is formed by the overlap of the $sp^2$ hybrid orbital of carbon and the $1s$ orbital of hydrogen. This is correct.$III$. The $\pi$ bond is formed by the lateral overlap of unhybridized $2p_z$ orbitals,which is a $p\pi-p\pi$ bond. This is correct.$IV$. In ethene,the $H-C-H$ bond angle is approximately $117.6^\circ$ and the $H-C-C$ bond angle is approximately $121.2^\circ$. Thus,the $H-C-H$ bond angle is smaller than the $H-C-C$ bond angle. This statement is incorrect.$V$. The $\pi$ bond has a nodal plane that is perpendicular to the molecular plane. This statement is incorrect.

Column-$I$	Column-$II$
$(P)$ $\underline PCl_5 \to PCl_3 + Cl_2$	$(i)$ Change in hybridisation
$(Q)$ $\underline SO_3 \to \underline SO_2 + \frac{1}{2}O_2$	$(ii)$ Change in bond angle
$(R)$ $\underline NH_3 + H^{+} \to \underline NH_4^+$	$(iii)$ Change in shape
$(S)$ $H_2\underline O + H^{+} \to H_3\underline O^{+}$	$(iv)$ Change in oxidation state

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