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(D) In $S_3O_9$,the structure consists of $S-O-S$ linkages where sulfur atoms are $sp^3$ hybridized. The $\pi$ bonds present are $p\pi - d\pi$ bonds.I

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$SO_3 - $ both $p\pi - p\pi$ and $p\pi - d\pi$ bonds present

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(D) In $S_3O_9$,the structure consists of $S-O-S$ linkages where sulfur atoms are $sp^3$ hybridized. The $\pi$ bonds present are $p\pi - d\pi$ bonds.In $P_4O_{10}$,there are $16 \ \sigma$ bonds and $4 \ \pi$ bonds. Thus,they are not equal.In $P_4O_6$,there are no $\pi$ bonds as all phosphorus atoms are $sp^3$ hybridized and form only $\sigma$ bonds.In $SO_3$ (cyclic trimer or monomeric gas),the sulfur atom forms $\pi$ bonds with oxygen using its $d$-orbitals. Specifically,in the monomeric $SO_3$,there are $p\pi - p\pi$ and $p\pi - d\pi$ bonds. Thus,option $D$ is correct.

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