In which one of the following molecules strongest back donation of an electron pair from halide to boron is expected?
Question:
In which one of the following molecules strongest back donation of an electron pair from halide to boron is expected?
Correct Option: , 2
Solution:
Type of back bonding
$\mathrm{BF}_{3}$ $\begin{array}{lll}\mathrm{BCl} & \mathrm{BBr}_{3} & \mathrm{BI}_{3}\end{array}$
Therefore back bonding strength is as follows
$\mathrm{BF}_{3}>\mathrm{BCl}>\mathrm{BBr}_{3}>\mathrm{BI}_{3}$
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