Q.

Which of the following fluorides does not exist ?

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a

NF5

b

PF5

c

AsF5

d

SbF5

answer is A.

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Detailed Solution

Nitrogen does not have empty d orbitals. Hence it is unable to form more than 4 bonds. Hence, NF5​ doesn't exist but all other pentafluorides of 15 group elements exist as they have vacant d-orbitals.
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Which of the following fluorides does not exist ?