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Q.

The molecular shapes of SF4 , CF4 and XeF4 are

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a

the same with 2,0 and 1 lone pairs of electrons on the central atom, respectively

b

different with 0,1 and 2 lone pairs of electrons on the central atom, respectively

c

the same with 1, 1 and 1 lone pair of electrons on the central atom, respectively

d

different with 1,0 and 2 lone pairs of electrons on the central atom, respectively

answer is B.

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Detailed Solution

Number of valence electrons in SF4 = 6 + 4 x 7 = 34. These are distributed as follows.

Question Image

There are five paired of electrons around S. The shape of SF4 will be trigonal bipyramide with one lone pair of electrons on the S atom.

Number of Valence electrons in CF4 = 4 + 4 x 7 = 32. These are distributed as follows.

Question Image

There are four paired of electrons around C. The shape of CF4 is tetrahedral. There is no lone pair of electrons on the C atom.

Obviously the choice b is correct. The molecule of XeF4 will have different geometry with two lone pairs of electrons on Xe atom. There are 36 (= 8 + 4 x 7) valence electrons and these are distributed as follows.

Question Image

The shape of XeF4 will be square planar.

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