MCQ
Which of the following elements never show positive oxidation number
- A$O$
- B$Fe$
- C$Ga$
- ✓$F$
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

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: