JEE Advanced Chemistry question

Which of the following species have undistorted octahedral structures? I. SF6 II. PF6− III. SiF6²− IV. SeF6 Select the correct answer using the codes given below

(A)II, III and IV
(B)I, III and IV
(C)I, II and III
(D)I, II and IVCorrect

Answer: (D)

Solution

A regular (undistorted) octahedron requires six identical bonded groups around the central atom with no lone pairs to skew the geometry. In SF6, S uses all 6 valence electrons in bonding (sp3d2, zero lone pairs); in PF6⁻, P likewise forms six bonds with no lone pair remaining; and in

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Question ID VK-159366