Chemistry - Carboxylic acid and their Derivatives Question with Solution | TestHub

Question Explanation:

Identify the final product Z

Concept: Chemical reaction of Alkyl halide

Solution :  

Step 1: Reaction with NaCN

CH₃–CH₂–CH₂–Br $\stackrel{NaCN}{\to }$

CN⁻ does Sɴ2 substitution.

Carbon of CN⁻ attacks → chain length increases by one carbon.

X = CH₃–CH₂–CH₂–C≡N (Butanenitrile)

Step 2: Acidic hydrolysis (H₃O⁺, Δ)

CH₃–CH₂–CH₂–C≡N $\stackrel{{\mathrm{H}}_3{\mathrm{O}}^{\oplus },∆}{\to }$

Y = CH₃–CH₂–CH₂–COOH (Butanoic acid)

Nitrile → carboxylic acid

Step 3: Reaction with ethanol in acidic medium (Fischer esterification)

CH₃–CH₂–CH₂–COOH $\underset{{\mathrm{H}}_{}^{+}}{\overset{C{H}_{3}C{H}_{2}OH}{\to }}$

Z = CH₃–CH₂–CH₂–COOCH₂CH₃