Q48 / 160 · JIPMER 2011 · Chemistry

Which of the following fluorides does not exist?

  • Correct answer
    A
    $\mathrm{NF}_5$
  • B
    $\mathrm{PF}_5$
  • C
    $\mathrm{AsF}_5$
  • D
    $\mathrm{SbF}_5$

Solution

P , As and Sb form pentahalides of the general formula $E X_5$ (where, $E=\mathrm{P}$, As and Sb ) due to the presence of vacant $d$-orbitals in their respective valence shell. N does not form pentahalides due to the absence of $d$-orbitals in its valence shell.

Hence, the correct answer is option: 'A'.

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