Consider the bond parameters of $S O_{2}, S O_{3}, H_{2} S O_{4}$ and $S O_{4}^{2 -}$
(I) $S - O$ bond length in
a) $S O_{2} and S O_{3}$ are same
b) $A l S - O$ bond length in $S O_{4}^{2 -}$ are same.
c) $H_{2} S O_{4}$ contain two types $S - O$ bond lengths
(II) Which of the following theories cannot explain the structures of the species $S O_{2}, S O_{3}, S O_{4}^{2 -}$ and $H_{2} S O_{4}$

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Lewis octet theory

VSEPR theory

Valence bond theory

Hybridisation and resonance theories

answer is A.

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Detailed Solution

(I) The single and double bond energies in $H_{2} S O_{4}$ are not same. Also two $S - O$ bond energies in $S O_{2} (537 K J / m o l) and S O_{3} (474 K J / m o l)$ are not same due to the presence of different number of $d π - p π$ bonds. The remaining statements are correct
(II) The structures cannot be explained using octet theory. Octet theory explains only the formation of covalent bonds by sharing electrons. It is completely silent about energy changes and shapes. The other theories can explain the structure of the species given.