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Question: Answered & Verified by Expert
In BX3,B-X distance is shorter than what is expected theoretically because (X = F, Cl, Br, I)
Chemistryp Block Elements (Group 13 & 14)NEET
Options:
  • A sp3 hybridisation of B is responsible for shorter B-X distance
  • B B-X has a double bond character due to back-bonding
  • C Dimerisation takes place in BX3 which is responsible for shorter B-X distance
  • D Due to large size of X, B-X distance decreases
Solution:
1101 Upvotes Verified Answer
The correct answer is: B-X has a double bond character due to back-bonding
Due to back-bonding, B-X in BX3 has double bond character which is resonance stabilized and decreases bond length.

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