JEE Main 2026 — Jan 22, Shift 1 — Chemistry solution

JEE Main2026Jan 22, Shift 1Chemistry

Two p-block elements X and Y form fluroides of the type $E F_{3}$ . The fluoride compound $X F_{3}$ is a Lewis acid and $Y F_{3}$ is a Lewis base. The hybridization of the central atoms of $X F_{3}$ and $Y F_{3}$ respectively are

A
Both $s p^{3}$
B
$s p^{2}$ and $s p^{3}$
C
$s p^{3}$ and $s p^{2}$
D
Both $s p^{2}$

Solution

$X F_{3}$ behaves as a Lewis acid: it has no lone pair on the central atom and an empty orbital. The classic example is $B F_{3}$ — trigonal planar, $s p^{2}$ hybridised.

$Y F_{3}$ behaves as a Lewis base: the central atom carries a lone pair to donate. The classic example is $N F_{3}$ — trigonal pyramidal, $s p^{3}$ hybridised.

So $X F_{3}$ is $s p^{2}$ and $Y F_{3}$ is $s p^{3}$ .

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