What is the name of the class of products formed in the reaction $RCOOH + H_2N\phi \rightarrow RCONH\phi$? [Here $\phi = C_6H_5$]

Which of the following is most acidic?

What happens when $LiAlH_4$ is added to an ester?

The order of acidic strength of the following acids is:

Which one of the following on heating gives an unsaturated acid?

Identify the compounds $A$,$B$,and $C$ in the following reaction sequence:
$CH_3-Br$ $\xrightarrow{Mg, \text{Ether}} [A]$ $\xrightarrow[(ii) \text{Water}]{(i) CO_2} [B]$ $\xrightarrow{CH_3OH, H^+} [C]$