NEET 2023 — Chemistry solution

NEET2023Chemistry

Amongst the following, the total number of species NOT having eight electrons around central atom in its outer most shell, is

NH $_{3}$ , AlCl $_{3}$ , BeCl $_{2}$ , CCl $_{4}$ , PCl $_{5}$ :

Solution

Counting valence electrons around the central atom:

$NH_{3}$ : $8$ (3 bond pairs + 1 lone pair) — satisfies octet.

$AlCl_{3}$ : $6$ — incomplete octet.

$BeCl_{2}$ : $4$ — incomplete octet.

$CCl_{4}$ : $8$ — satisfies octet.

$PCl_{5}$ : $10$ — expanded octet.

Three species ( $AlCl_{3}$ , $BeCl_{2}$ , $PCl_{5}$ ) do not have exactly eight electrons.

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