In esterification,the $OH^-$ ion for making $H_2O$ comes from

An acyl halide is formed when $PCl_5$ reacts with an

Identify $B$ in the following sequence of reactions.
Acetic acid $\xrightarrow[\Delta]{\text{Thionyl chloride}} A$ $\xrightarrow{\text{Ammonia}} B$

In the following reaction: $CH_3COOH + PCl_5$ $\rightarrow (A)$ $\xrightarrow[(2) H_2O]{(1) CH_3MgBr} (B)$,product $(B)$ would be:

How many organic products will be formed when the following compound undergoes decarboxylation?
(Image: $A$ substituted cyclopentane ring with two $-COOH$ groups at the same carbon atom,and two $-CH_3$ groups at adjacent carbons.)

Given below are some statements concerning formic acid. Which of them is true?