NTA Abhyas NEET2020Chemistryp Block Elements (Group 13 & 14)Practice
In B X 3 , B - X distance is shorter than what is expected theoretically because (X = F, Cl, Br, I)
Options
- As p 3 hybridisation of B is responsible for shorter B - X distance
- BB - X has a double bond character due to back-bonding
- CDimerisation takes place in B X 3 which is responsible for shorter B - X distance
- DDue to large size of X, B - X distance decreases
Correct answer
B. B - X has a double bond character due to back-bonding
Step-by-step solution
Due to back-bonding, B - X in B X 3 has double bond character which is resonance stabilized and decreases bond length.