Question

Which one of the following compounds forms a red coloured solution on treatment with neutral $\text{FeC}{{\text{l}}_{\text{3}}}$ solution ?

• A. $C{{H}_{3}}COC{{H}_{3}}$
• B. $C{{H}_{3}}OC{{H}_{3}}$
• C. $C{{H}_{3}}C{{H}_{2}}OH$
• D. $C{{H}_{3}}COOH$

Answer 1

Answer: (D)

$C{{H}_{3}}COOH$

Answer 2

Acetic acid forms red coloured solution with neutral $\text{FeC}{{\text{l}}_{\text{3}}}\text{.}$ Red colour is due to the formation of ferric acetate. $3C{{H}_{3}}COOH+FeC{{l}_{3}}\xrightarrow{{}}\underset{\text{Ferric}\,\text{acetate}}{\mathop{{{(C{{H}_{3}}COO)}_{3}}}}\,Fe$ $+3HCl$