AIEEE 2008 Solved Paper

Section: Chemistry

Question : 3 of 104

Marks: +1, -0

The bond dissociation energy of B−F‌in ‌BF3 is 646‌jJ‌mol−1 whereas that of C−F in CF4 is 515‌kj‌mol−1. The correct reason for higher B−F bond dissociation energy as compared to that of C−F is

[AIEEE 2008]

stronger σ bond between B and F in BF3 as compared to that between C and F in CF4
significant pπ−pπ interaction between B and F in BF3 whereas there is no possibility of such interaction between C and F in CF4
lower degree of pπ−pπ interaction between B and F in BF3 than that between C and F in CF4
smaller size of B - atom as compared to that of C- atom.

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