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  • The order of increasing acidic character of boron halide isOption: 1 <img alt="\mathrm{B F_{3}>B C l_{3}>B B r_{3}}" src="https://entrancecorne

The order of increasing acidic character of boron halide is

Option: 1

\mathrm{B F_{3}>B C l_{3}>B B r_{3}}


Option: 2

\mathrm{B F_{3}<B C l_{3}<B B r_{3}}


Option: 3

\mathrm{B B r_{3}<B F_{3}<B C l_{3}}


Option: 4

\mathrm{B C l_{3}>B B r_{3}>B F_{3}}


Answers (1)

best_answer

As we have learnt,

As the size of halogen increases from F to Br, the extent of its back bonding with Boron decreases due to ineffective overlap in differently sized orbitals. So the lewis acidic character of the Boron Trihalide increases as the size of the Halogen increases.

Order of increasing acidic charcater of Boron halides 

\mathrm{BF_3 < BCl_3 < BBr_3}

Therefore, option (2) is correct.

Posted by

Nehul

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