Reduction of carboxylic acid gives _________.

${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{COONa}+\mathrm{NaOH}\underset{∆}{\overset{\mathrm{CaO}}{\to }}\mathrm{A}+\mathrm{B};$

A and B are respectively _________.

The reaction ${\mathrm{CH}}_3\mathrm{COOH} + {\mathrm{Cl}}_2$ $\stackrel{\text{Red P}}{\to }$ ${\mathrm{ClCH}}_2\mathrm{COOH} + \mathrm{HCl}$ is called _______.

Diacetone alcohol on heating gives ________.