Question

BCl₃ does not exist as dimer but BH₃ exist as dimer (B₂H₆ ) because: 

(A) Chlorine is more electronegative than hydrogen 

(B) There is pπ-pπ back bonding in BCl₃ but BH₃ does not contain such multiple bonding 

(C) Large sized chlorine atoms do not fit in between the small boron atoms whereas small sized hydrogen atoms get fitted in between boron atoms 

(D) None of the above

Answer 1

(C) Large sized chlorine atoms do not fit in between the small boron atoms whereas small sized hydrogen atoms get fitted in between boron atoms