1.

4-Nitrotoluene is trated with bromine to get compound 'P'. 'P' is reduced with Sn and HCl to get compound 'Q', 'Q' is diazotised to and the product is treated with phosphinic acid to get compound 'R'. 'R' is oxidised with alkaline KMnO_(4) to get compound 'X'. compound 'S' is

Answer»

2-bromo-4-hydroxybenzoic acid
benzoic acid
4-bromobenzoic acid
2-bromobenzoic acid

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