Amongst the following which one will have maximum 'lone pair - lone pair' electron repulsions?
(1) X

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Question

Amongst the following which one will have maximum 'lone pair - lone pair' electron repulsions?
(1) XeF2 (2) ClF3 (3) IF5 (4) SF4

Accepted Answer

Correct Answer: A - XeF2Step-by-step Solution:Counting lone pairs (LP) on the central atom using VSEPR:XeF2: Xe has 8 valence electrons; 2 used in bonds to F; 6 remain as 3 lone pairs. Total electron pairs = 5 (trigonal bipyramidal electron geometry); 3 LP, 2 BP.ClF3: Cl has 7 valence electrons; 3 used in bonds; 4 remain as 2 lone pairs. Total = 5; 2 LP, 3 BP.IF5: I has 7 valence electrons; 5 used in bonds; 2 remain as 1 lone pair. Total = 6; 1 LP, 5 BP.SF4: S has 6 valence electrons; 4 used in bonds; 2 remain as 1 lone pair. Total = 5; 1 LP, 4 BP.XeF2 has the most lone pairs (3) among the given options. With 3 lone pairs in equatorial positions of a trigonal bipyramidal arrangement, there are three LP-LP repulsions at 120° between the equatorial lone pairs, making XeF2 the molecule with maximum lone pair-lone pair repulsion.Key Concepts:VSEPR: Lone pair-lone pair repulsion > Lone pair-bond pair > Bond pair-bond pair.Lone pairs on central atoms in these molecules: XeF2 (3 LP) > ClF3 (2 LP) > IF5 = SF4 (1 LP each).Shape of XeF2 = linear; ClF3 = T-shaped; IF5 = square pyramidal; SF4 = see-saw.

Amongst the following which one will have maximum 'lone pair - lone pair' electron repulsions? (1) XeF2 (2) ClF3 (3) IF5 (4) SF4

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Amongst the following which one will have maximum 'lone pair - lone pair' electron repulsions? (1) XeF2 (2) ClF3 (3) IF5 (4) SF4

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