BCl3 does not exist as dimer but BH3 exists as dimer (B2H6) because (A) chlorine is more electronegative than hydrogen (B) there is pπ - pπ back bonding in BCl3 and BH3 does not contain such multiple bonding (C) large sized chlorine atoms do not fit in between the small boron atoms where as small sized hydrogen atoms get fitted in between boron atoms (D) none of the above

large-sized chlorine atoms do not fit in between the small boron atoms whereas small-sized hydrogen atoms fit between boron atoms

Hydrogen is of small size, so it easily forms a bridge without caustic steric hindrance whereas the chlorine size is larger than boron. Hence, it is not able to form a bridge. So, BCl3 does not exist as a dimer due to large size of chlorine.

Therefore, BCl3 does not exist as dimer but BH3 exists as a dimer (B2H6) because of large size of chlorine

So, the correct option is (C)

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