Hybridization of XF3 and YF3 based on Lewis acid base nature
Q. Two p-block elements X and Y form fluorides of the type EF3. The fluoride compound XF3 is a Lewis acid and YF3 is a Lewis base. The hybridizations of the central atoms of XF3 and YF3 respectively are
A. sp2 and sp3
B. Both sp3
C. Both sp2
D. sp3 and sp2
Correct Answer: sp2 and sp3

Explanation

XF3 behaves as a Lewis acid, which means the central atom has an incomplete octet and can accept an electron pair.

For EF3 acting as a Lewis acid (like BF3), the central atom forms three σ-bonds and has no lone pair.

Number of electron domains around X = 3

Hence, hybridization of X in XF3 is sp2.

YF3 behaves as a Lewis base, which means the central atom has at least one lone pair available for donation.

For EF3 acting as a Lewis base (like NF3), the central atom has three bond pairs and one lone pair.

Total electron domains around Y = 4

Hence, hybridization of Y in YF3 is sp3.

Therefore, the correct hybridizations are:

XF3 → sp2
YF3 → sp3

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Keywords

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