BCl 3 does not exist as a dimer but BH 3 exists as B 2 H 6 because

Chemistry · JEE Main · NTA Exams — p-Block Elements

1. Cl₂ is more electronegative than hydrogen
2. large size of chlorine atom does not fit between small
   sized boron atoms, while small-sized hydrogen atoms occupy the space between boron atoms
3. There is pπ-dπ back bonding in BCl₃
4. Both (b ) and (c )

Answer

(B) large size of chlorine atom does not fit between small sized boron atoms, while small-sized hydrogen atoms occupy the space between boron atoms

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