TS EAMCET · Chemistry · p Block Elements (Group 13 & 14)
The correct order of Lewis acidic character of boron trihaldes is
- A \(\mathrm{BF}_3>\mathrm{BCl}_3>\mathrm{BI}_3>\mathrm{BBr}_3\)
- B \(\mathrm{BI}_3>\mathrm{BBr}_3>\mathrm{BF}_3>\mathrm{BCl}_3\)
- C \(\mathrm{BI}_3>\mathrm{BBr}_3>\mathrm{BCl}_3>\mathrm{BF}_3\)
- D \(\mathrm{BF}_3>\mathrm{BCl}_3>\mathrm{BBr}_3>\mathrm{BI}_3\)
Answer & Solution
Correct Answer
(C) \(\mathrm{BI}_3>\mathrm{BBr}_3>\mathrm{BCl}_3>\mathrm{BF}_3\)
Step-by-step Solution
Detailed explanation
On moving down the group, the size of atom increases and ability of back bonding decreases which makes them more acidic. Hence, the Lewis acidic character of boron halide is \(\mathrm{BI}_3>\mathrm{BBr}_3>\mathrm{BCl}_3>\mathrm{BF}_3\).
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