Home Chemistry S and P - Block Elements (S - Block Elements Not In Syllabus ) Compounds of Boron and Aluminium Acidic strength of Boron trihalide is in ord…
Chemistry S and P - Block Elements (S - Block Elements Not In Syllabus ) Compounds of Boron and Aluminium Single Correct MCQ
Published on: August 13, 2026

Acidic strength of Boron trihalide is in order :

A
BF 3 < BCl 3 < BBr 3 < BI 3
B
BI 3 < BBr 3 < BCl 3 < BF 3
C
BBr 3 < BCl 3 < BF 3 < BI 3
D
BF 3 < BI 3 < BCl 3 < BBr 3

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Verified by Experts
The correct answer is:
A

Acidic strength of Boron trihalide increases in the order of BF 3 < BCl 3 < BBr 3 < BI 3 as from F(2p) to I (5p), the energy level difference between boron and halides increases and thus p π -p π back bonding becomes less effective.

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