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.

List-$I$ (Classification of molecules based on octet rule)	List-$II$ (Example)
$A$. Molecules obeying octet rule	$I$. $NO, NO_2$
$B$. Molecules with incomplete octet	$II$. $BCl_3, AlCl_3$
$C$. Molecules with odd electron	$III$. $H_2SO_4, PCl_5$
$D$. Molecules with expanded octet	$IV$. $CCl_4, CO_2$

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