# Which of the following carboxylic acid under goes decarboxylation easily?

$\begin{array}{1 1}(a)\;C_6H_5COOH&(b)\;C_6H_5CH(OH)COOH\\(c)\;C_6H_5COCH_2COOH&(d)\;None\end{array}$

$\beta$-keto acids are unstable acids.These readily under go decarboxylation through a cyclic transition state.The mechanism is given below:
Hence (c) is the correct answer.