Following compounds are given A. $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OH}$ B. $\mathrm{CH}_3 \mathrm{COCH}_3$ C.
$$ \text { D. } \mathrm{CH}_3 \mathrm{OH} $$ Which of the above compound(s), on being warmed with iodine solution and $\mathrm{NaOH}$, will give iodoform?

• A

  A, C and D
• B

  Only B
• Correct answer
  C

  A, B and C
• D

  A and B

Solution

$$ \text { Compounds having either } $$
$$ \text { group or } $$ $\mathrm{CH}_3 \mathrm{CHOH}-$ group, give iodoform when warmed with $\mathrm{I}_2$ and $\mathrm{NaOH}$. Thus,
give iodoform when warmed with $\mathrm{I}_2$ and $\mathrm{NaOH}$. (Remember, NaOI oxidises $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OH}$ to $\mathrm{CH}_3 \mathrm{CHO}$, thus it gives positive iodoform test.)

Hence, the correct answer is option: 'C'.