MCQ
Kolbe-Schmidt reaction is used for
- ✓Salicylic acid
- BSalicylaldehyde
- CPhenol
- DHydrocarbon

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$A$ and $B$ is
Statement $(I)$ : The $4 \mathrm{f}$ and $5 \mathrm{f}$ - series of elements are placed separately in the Periodic table to preserve the principle of classification.
Statement $(II)$ :$S$-block elements can be found in pure form in nature. In the light of the above statements, choose the most appropriate answer from the options given below :