Question

convert acid to alkane​

Answer 1

Red P in HI is a reagent that is used to generate Nascent Hydrogen.

This reaction is one of the method of synthesis of alkanes from alcohol/aldehydes/acids.

E.g.

C2H5COOH + 6HI ——Red P/200*c——- C2H6 + H2O + I2

So, yes this reducing agent is used to convert carboxylic acids to saturated hydrocarbon.

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