Which of the following fluorides does not exist?
(a) NF5 (b) PF5 (c) AsF5 (d) SbF5

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(a) NF5 does not exist because N does not form pentahalides due to the absence of d-orbital in its valence shell. While P, As and Sb form pentahalides of the general formula MX5 (where, M = P, As and Sb) due to the presence of vacant d-orbitals in their respective valence shell.

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