In the following sequence of reactions,$CH_3-Br$ $\xrightarrow{KCN} A$ $\xrightarrow{H_3O^{+}} B$ $\xrightarrow[ether]{LiAlH_4} C$,the end product $(C)$ is:

Number of $CO_2$ molecules evolved upon heating the given compound.

In the quick vinegar process of acetic acid,the temperature of the mixture is ......... $K$.

Dimerisation in carboxylic acid is due to

Consider the following compounds:
$(i) \, C_6H_5COCl$
$(ii) \, p-NO_2-C_6H_4-COCl$
$(iii) \, p-CH_3-C_6H_4-COCl$
$(iv) \, p-CHO-C_6H_4-COCl$
The correct decreasing order of their reactivity towards hydrolysis is:

For the reaction below, the product is $Q$.
The compound $Q$ is