The correct sequence of decreasing numbe...

The correct sequence of decreasing number of `pi` - bonds in the structure of `H_2SO_3,H_2SO_4 and H_2S_2O_7` is :

A

`H_2S_2O_7 gtH_2SO_3 gtH_2SO_4`

B

`H_2S_2O_7 gtH_2SO_4 gtH_2SO_3`

C

`H_2SO_4gtH_2S_2O_7 gtH_2SO_3`

D

`H_2SO_3gtH_2SO_4gtH_2S_2O_7`

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The correct Answer is:

B

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