Q41 / 180 · AIIMS 2004 · Chemistry

Assertion : All $\mathrm{F}-\mathrm{S}-\mathrm{F}$ angle in $\mathrm{SF}_4$ is greater than $90^{\circ}$ but less than $180^{\circ}$. Reason : The lone pair-bond pair repulsion is weaker than bond pair-bond pair repulsion.

  • A
    If both assertion and reason are true and reason is the correct explanation of assertion
  • B
    If both assertion and reason are true but reason is not the correct explanation of assertion
  • Correct answer
    C
    If assertion is true but reason is false
  • D
    If both assertion and reason are false.

Solution

Due to greater lone pair - bond pair repulsions than bond pair - bond pair repulsions, the $F-S-F$ bond angle decreases from $180^{\circ}$.

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

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