Molecular formulae and shapes of some molecules are given below. Choose the incorrect match.

N H_{3}

- Trigonal pyramidal

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S F_{4}

- Tetrahedral

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C I F_{3}

- T-shaped

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P C l_{5}

- Trigonal bipyramidal

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B F_{3}

- Trigonal planar

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Solution

The correct option is B $S F_{4}$ - Tetrahedral
$N H_{3} \Rightarrow 3 b p + 1 l p =$ trigonal pyramidal
$S F_{4} \Rightarrow 4 b p + 1 l p \Rightarrow$ see-saw shape
$C l F_{5} \Rightarrow 3 b p + 2 l p \Rightarrow$ T-shaped
$P C l_{5} \Rightarrow 5 b p + 0 l p \Rightarrow$ trigonal bipyramidal
$B F_{3} \Rightarrow 3 b p + 0 l p \Rightarrow$ trigonal planar
Thus, the given shape of $S F_{4}$ is incorrect.

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