PCl₅ exist but NCl₅ does not because

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Nitrogen is highly inert

Nitrogen atom is much smaller

Nitrogen has no vacant orbitals

NCl₅ is unstable

answer is B.

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Detailed Solution

PCl₅ forms five bonds by using the d-orbitals to "expand the octet" and have more places to put bonding pairs of electrons.NCl₅ does not exist because there are no d-orbitals in the second energy level. Therefore there is no way to arrange five pairs of bonding electrons around a nitrogen atom.

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