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Q.

In which of the following molecules I ions are all the bonds not equal

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a

${BF}_{4}^{-}$

b

${SF}_{4}$

c

${SiF}_{4}$

d

${XeF}_{4}$

answer is B.

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Detailed Solution

We have:

	No. of valence electrons	Lone pairs around the central atom	Arrangement of lone pairs
${BF}_{4}^{-}$	32	4	Tetrahedral
${SF}_{4}$	34	5	Trigonal bipyramide
${SiF}_{4}$	32	4	Tetrahdral
${XeF}_{4}$	36	6	Octahedral (geometry: square planar)

In SF₄ , all bonds will not be identical as its structure is

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