Which of the following statements regarding B | vedclass

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(D) $BCl_3$ is a covalent molecule with a trigonal planar geometry.It is an electron-deficient compound with an incomplete octet on the boron atom,whi

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All $B-Cl$ bonds in $BCl_3$ are longer than a single bond.

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(D) $BCl_3$ is a covalent molecule with a trigonal planar geometry.It is an electron-deficient compound with an incomplete octet on the boron atom,which makes it a strong Lewis acid.Unlike $AlCl_3$,$BCl_3$ does not form a dimer because the small size of the boron atom prevents the formation of a stable bridged structure.Due to back-bonding from the chlorine lone pair to the empty $p$-orbital of boron,the $B-Cl$ bond acquires some double-bond character.This back-bonding results in a bond length that is shorter than a standard $B-Cl$ single bond.Therefore,the statement that all $B-Cl$ bonds are longer than a single bond 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	$IV$. $CCl_4, CO_2$

Which of the following statements regarding $BCl_3$ is incorrect?

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