Which of the following carboxylic acids will undergo decarboxylation most easily?

Iodoform test is not given by:

Identify the product $B$ in the following series of reaction.
$CH_3COOH + CH_3CH_2OH \rightleftharpoons{H^{+}} CH_3COOCH_2CH_3{_{\text{(A)}}} \xrightarrow[Ni/Pd, \Delta]{H_2} CH_3CH_2OH + CH_3CH_2OH{_{\text{(B)}}}$

Ethanoic acid undergoes Hell-Volhard Zelinsky reaction but methanoic acid does not,because of

An optically active compound $'X'$ having molecular formula $C_4H_8O_3$ evolves $CO_2$ with $NaHCO_3$. $'X'$ on treatment with $LiAlH_4$ gives an achiral compound. Then $'X'$ is

Identify the reason for the highest boiling point of $R-COOH$ as compared to alkanes, ethers, alcohols and aldehydes.