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Q.

PCl5 exist but NCl5 does not because

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a

NCl5 is unstable

b

Nitrogen has no vacant orbitals

c

Nitrogen atom is much smaller

d

Nitrogen is highly inert

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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