Identify product $B$ in the above reaction sequence.

Write a note on the reaction occurring in the hydrocarbon part of carboxylic acid or write a note on the Hell-Volhard-Zelinsky reaction.

What is the correct order of acidity of salicylic acid, $4-$hydroxybenzoic acid, and $2,6-$dihydroxybenzoic acid?

Identify the structure of product $A$ in the following reaction:
$\text{Cyclohexanecarboxylic acid} \xrightarrow{LiAlH_4} A$

Two statements are given below:
Statement $I:$ The melting point of monocarboxylic acids with an even number of carbon atoms is higher than that of acids with an odd number of carbon atoms immediately below and above it in the series.
Statement $II:$ The solubility of monocarboxylic acids in water decreases with an increase in molar mass.
Choose the most appropriate option.

Which one of the following is not an intermediate in the generally accepted mechanism for the reaction shown below?
$CF_3C(O)OH + CH_3CH(OH)CH_3 \xrightarrow{H_2SO_4} CF_3C(O)OCH(CH_3)_2 + H_2O$