MCQ
Which of the following processes is reversible
- AHalogenation
- ✓Sulphonation
- CNitration
- DNone

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[Assume : No cyano complex is formed; $K _{ sp }( AgCN )$ $=2.2 \times 10^{-16}$ and $\left. K _{ a }( HCN )=6.2 \times 10^{-10}\right]$
