BCl_3 does not exist as a dimer,but BH_3 exis | vedclass

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(C) In $BCl_3$,the large size of chlorine atoms causes steric hindrance,preventing the formation of a dimer structure.Additionally,$BCl_3$ is stabiliz

Vedclass · Accepted Answer

Large-sized chlorine atoms do not fit in between the small boron atoms,whereas small-sized hydrogen atoms fit in between boron atoms.

Vedclass · Answer

(C) In $BCl_3$,the large size of chlorine atoms causes steric hindrance,preventing the formation of a dimer structure.Additionally,$BCl_3$ is stabilized by $p\pi - p\pi$ back bonding between the filled $p$-orbitals of chlorine and the empty $p$-orbital of boron.In contrast,hydrogen atoms are small and do not cause steric hindrance,allowing $BH_3$ to form the bridged dimer $B_2H_6$ to complete the octet of boron atoms.Therefore,the primary reason $BCl_3$ does not dimerize is the steric factor and the stability provided by back bonding.

List-$I$	List-$II$
$(A)$ $C_{2}H_{4}$	$(I)$ $3\sigma$ bonds, $2\pi$ bonds
$(B)$ $C_{2}H_{2}$	$(II)$ $3\sigma$ bonds, $1$ lone pair
$(C)$ $CH_{4}$	$(III)$ $4\sigma$ bonds
$(D)$ $NH_{3}$	$(IV)$ $5\sigma$ bonds, $1\pi$ bond

$BCl_3$ does not exist as a dimer,but $BH_3$ exists as a dimer $(B_2H_6)$ because:

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