$$p$$-cresol reacts with chloroform in alkaline medium to give the compound A which adds hydrogen cyanide to form, the compound $$B.$$ The latter on acidic hydrolysis gives chiral carboxylic acid. The structure of the carboxylic acid is :

Among the following acids which has the lowest pK_a value?

On mixing ethyl acetate with aqueous sodium chloride, the composition of the resultant solution is

Which of the following undergoes reaction with 50% sodium hydroxide solution to give the corresponding alcohol and acid?