MCQ
Functional group present in sulphonic acid is:
- A$\mathrm{SO}_4 \mathrm{H}$
- ✓$\mathrm{SO}_3 \mathrm{H}$
- C

- D$-\mathrm{SO}_2$


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[Given $pK _{ a }$ of $CH _{3} COOH =4.57$ ]
