Propanoic acid is treated with Cl2 and a little red phosphorus to give A. A is heated with excess aqueous NH3 to give B. B is treated with NaNO2/HCl to give C (with evolution of N2). C is

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Propanoic acid is treated with $Cl X_{2}$ and a little red phosphorus to give A. A is heated with excess aqueous $NH X_{3}$ to give B. B is treated with $NaNO X_{2} / HCl$ to give C (with evolution of $N X_{2}$ ). C is

A2-hydroxypropanoic acid
B3-hydroxypropanoic acid
Cpropanoic acid
D2-chloropropanoic acid

Answer: A

HVZ halogenation gives 2-chloropropanoic acid (A). Ammonolysis gives 2-aminopropanoic acid (B). The primary amino group reacts with nitrous acid, releasing

N X_{2}

and being replaced by OH on the same carbon, giving

CH X_{3} CH (OH) COOH

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Propanoic acid is treated with ClX2​ and a little red phosphorus to give A. A is heated with excess aqueous NHX3​ to give B. B is treated with NaNOX2​/HCl to give C (with evolution of NX2​). C is

Answer: A

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Propanoic acid is treated with $Cl X_{2}$ and a little red phosphorus to give A. A is heated with excess aqueous $NH X_{3}$ to give B. B is treated with $NaNO X_{2} / HCl$ to give C (with evolution of $N X_{2}$ ). C is