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Covalent Bonding

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Question

How many of the following compounds have $(pπ - dπ)$ multiple bonds?
$(i) {SO}_{2} (ii) {SO}_{3} (iii) H {SO}_{4}^{⊝} (iv) {SO}_{4}^{2 -} (v) {SO}_{3}^{2 -} (vi) H {SO}_{3}^{⊝}$

Moderate

Solution

${i. SO}_{2} \Rightarrow one (pπ - pπ) and one (pπ - dπ) bond.$
$ii. {SO}_{3} \Rightarrow one (p π - p π) and two (p π - d π) bond.$
$iii. {HSO}_{4}^{-} {and iv. SO}_{4}^{- 2} both have 2 (pπ - dπ) bond.$
$v. {SO}_{3}^{- 2} and vi . {HSO}_{3}^{⊝} both have one (pπ - pπ) bond.$
Thus, (i) to iv have $(pπ - dπ)$ multiple bonds.

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