$A$ carboxylic acid is converted into its anhydride using:

Arrange these carboxylic acids in decreasing order of ease of esterification with $CH_3OH/H^{+}$:
$(I)$ $CH_3-CH(CH_3)-COOH$
$(II)$ $CH_3-CH(CH_3)-CH_2-COOH$
$(III)$ $CH_3-C(CH_3)_2-COOH$
$(IV)$ $(CH_3-CH_2)_3C-COOH$

What is the major product of the following reaction sequence: $CH_3-CH_2-Br$ $\xrightarrow{KCN}$ $\xrightarrow[H_2O]{OH^{-}}$ $\xrightarrow{PCl_5, \Delta} \text{product}$?

Which of the following reduces Tollen's reagent?

Ammonium acetate reacts with acetic acid at $110\,^{\circ}C$ to form:

When chloroform is hydrolysed with $KOH$,the final product is: