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31/12/2021 3:00 pm
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Find the order of Lewis acid strength of BI3, BCl3, BF3, BBr3.
(a) BF3 < BCl3 < BBr3 < BI3
(b) BF3 < BBr3 < BI3 < BCl3
(c) BCl3 < BF3 < BBr3 < BI3
(d) BBr3 < BF3 < BI3 < BCl3
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31/12/2021 3:01 pm
Correct answer: (a) BF3 < BCl3 < BBr3 < BI3
Explanation:
On the basis of back bonding, the smaller the halide atom, the more effective be the back bonding in BX3. More effective back bonding shows less tendency to accept a pair of electrons. Hence, correct order of Lewis acid for boron halide is BF3 < BCl3 < BBr3 < BI3.