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  4. Number of electron deficient molecules among the following PH 3, B 2 H 6, CCl 4, NH 3, LiH and BCl 3 is

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Q. Number of electron deficient molecules among the following
$PH _{3}, B _{2} H _{6}, CCl _{4}, NH _{3}, LiH$ and $BCl _{3}$ is

JEE MainJEE Main 2022The p-Block Elements

Solution:

Electron deficient species have less than $8$ electrons (or two electrons for $H$ ) in their valence (incomplete octet)
$B _{2} H _{6}, BCl _{3}$ have incomplete octet.