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JEE Advanced levelSingle correct optionDifficulty 3 of 3pn220

Using the structure $HO - SO X_{2} - O - SO X_{2} - OH$ for pyrosulphuric acid and counting each S=O as one sigma plus one pi bond, the total number of sigma and pi bonds in one $H X_{2} S X_{2} O X_{7}$ molecule together is

A18
B14
C16
D12

Answer: B

Sigma bonds: 8 S-O (each S has four: two S=O, one S-OH and one bridge S-O) plus 2 O-H = 10. Pi bonds: one per S=O, so 4. Total

= 10 + 4 = 14

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