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

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Question

(C) In $BCl_3$,the large size of chlorine atoms creates steric hindrance,preventing the formation of a bridged dimer structure. Additionally,$p\pi - p

Vedclass · Accepted Answer

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

Vedclass · Answer

(C) In $BCl_3$,the large size of chlorine atoms creates steric hindrance,preventing the formation of a bridged dimer structure. Additionally,$p\pi - p\pi$ back bonding stabilizes the monomeric $BCl_3$ molecule.In $BH_3$,the small size of hydrogen atoms allows them to easily fit between boron atoms to form the bridged structure $(B_2H_6)$,which is stabilized by $3c-2e$ (three-center two-electron) bonds.

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

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