1.

(I) H_(2)S_(2)O_(5) (II) H_(2)SO_(5) (III) H_(2)S_(2)O_(6) Increasing order of number of pi-bonds in above compounds

Answer»

`I lt II lt III`
`III lt II lt I`
`II lt I lt III`
`I gt III gt II`

Solution :`H_(2)S_(2)O_(5):HO-UNDERSET(O)underset(||)overset(O)overset(||)S-overset(O)overset(||)S-OH""`No. of `pi` BOND = 3
`H_(2)SO_(5):HO-underset(O)underset(||)overset(O)overset(||)S-O-O-H" "`No. of `pi` bond = 2
`H_(2)S_(2)O_(6): HO-underset(O)underset(||)overset(O)overset(||)S-underset(O)underset(||)overset(O)overset(||)S-OH""`No. of `pi` bond = 4


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