B and C both are correct.
Explanation -
A and B are reimer tieman reactions. A gives salicyldehyde while B gives salicylic acid.
C is kolbe's reaction and gives salicylic acid.
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B and C both are correct way
B is riemer tiemann reaction and C is kolbe schmitt reaction. A is riemar tiemann reaction in which salicylaldehyde is formed and in D sodium benzoate ...