Which of the following has $\mathrm{S}-\mathrm{S}$ bond?

1. $\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_6$
2. $\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_7$
3. $\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_8$
4. Mustard gas

Solution

Only $\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_6$ (thionic acid) contains $\mathrm{S}-\mathrm{S}$ bond. Its structure is

Asked in: AP EAMCET 2004

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