Question

Follwoing compounds are given : (a)${CH3CH2OH }$ (b)${ CH3COCH3}$ (c)$CH_3- \underset{\overset{|}{C}H_3}{C}HOH$ (d)${CH3OH }$ Which of the above compounds(s), on being warmed with iodine solution and $NaOH$, will give iodoform ?

• A. Only (b)
• B. (a), (b) and (c)
• C. (a) and (b)
• D. (a), (c) and (d)

Answer 1

Answer: (B)

(a), (b) and (c)

Answer 2

Compounds having either $\text{C}{{\text{H}}_{\text{3}}}\overset{\begin{smallmatrix} \text{O} \\\ \text{ }\\!\\!|\\!\\!\text{ }\\!\\!|\\!\\!\text{ } \end{smallmatrix}}{\mathop{\text{C}}}\,-$ group or CH3CHOH- group, give iodoform when warmed with ${{\text{I}}_{\text{2}}}$ and NaOH, Thus, $\text{C}{{\text{H}}_{\text{3}}}\underset{\begin{smallmatrix} \text{ }\\!\\!|\\!\\!\text{ } \\\ \text{H} \end{smallmatrix}}{\mathop{\text{C}}}\,\text{HOH,C}{{\text{H}}_{\text{3}}}-\overset{\begin{smallmatrix} \text{O} \\\ \text{ }\\!\\!|\\!\\!\text{ }\\!\\!|\\!\\!\text{ } \end{smallmatrix}}{\mathop{\text{C}}}\,-\text{C}{{\text{H}}_{\text{3}}}\text{,C}{{\text{H}}_{\text{3}}}-\underset{\begin{smallmatrix} \text{ }\\!\\!|\\!\\!\text{ } \\\ \text{C}{{\text{H}}_{\text{3}}} \end{smallmatrix}}{\mathop{\text{C}}}\,\text{HOH}$ give iodoform when warmed with ${{\text{I}}_{\text{2}}}$ and NaOH. (Remember, NaOl oxidises $\text{C}{{\text{H}}_{\text{3}}}\text{C}{{\text{H}}_{\text{2}}}\text{OH}$to$\text{C}{{\text{H}}_{\text{3}}}\text{CHO}$, thus it gives positive iodoform test.)