MCQ
There is no $S-S$ linkage is
- A$S_2O_3^{-2}$
- B$S_2O_5^{-2}$
- C$S_2O_6^{-2}$
- ✓$S_2O_7^{-2}$

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Assertion $A$: $\mathrm{pK}_{\mathrm{a}}$ value of phenol is $10.0$ while that of ethanol is $15.9$.
Reason $R$: Ethanol is stronger acid than phenol.In the light of the above statements, choose the correct answer from the options given below:
Consider the above reaction and identify the missing reagent/chemical.