Q.

How many of the following compounds have (pπ−dπ) multiple bonds?(i) SO2 (ii) SO3 (iii) H SO4⊝ (iv) SO42- (v) SO32- (vi) H SO3⊝

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answer is 4.

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Detailed Solution

i. SO 2⇒ one (pπ−pπ) and one (pπ−dπ) bond.  ii. SO3⇒ one (pπ−pπ) and two (pπ−dπ) bond.  iii. HSO4- and   iv. SO4-2 both have 2(pπ−dπ) bond.  v. SO3-2 and  vi.HSO3⊝ both have one (pπ−pπ) bond. Thus, (i) to iv have (pπ−dπ) multiple bonds.
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