Question:
Which one of the following undergoes iodoform test?
Which one of the following undergoes iodoform test?
Show Hint
Look for \(CH_3CO-\) or \(CH_3CH(OH)-\) group for iodoform test.
Updated On: May 8, 2026
- Propanal
- Ethanal
- Benzophenone
- Benzaldehyde
- Phenol
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Concept:
Iodoform test is given by compounds containing:
\[
-COCH_3 \quad \text{(methyl ketone)} \quad \text{or} \quad CH_3CH(OH)-
\]
Step 1: Understand reaction. \[ RCOCH_3 + I_2 + NaOH \rightarrow CHI_3 \downarrow + \text{other products} \] Yellow precipitate of iodoform confirms the test.
Step 2: Analyze each option. (A) Propanal: Structure: \(CH_3CH_2CHO\) Does not contain \(CH_3CO-\) group → no reaction. (B) Ethanal: Structure: \(CH_3CHO\) This behaves like methyl ketone in haloform reaction → gives iodoform. (C) Benzophenone: No methyl ketone group → no reaction. (D) Benzaldehyde: Aromatic aldehyde → no iodoform test. (E) Phenol: No carbonyl → no reaction. Final Conclusion: \[ \boxed{\text{Ethanal gives iodoform test}} \]
Step 1: Understand reaction. \[ RCOCH_3 + I_2 + NaOH \rightarrow CHI_3 \downarrow + \text{other products} \] Yellow precipitate of iodoform confirms the test.
Step 2: Analyze each option. (A) Propanal: Structure: \(CH_3CH_2CHO\) Does not contain \(CH_3CO-\) group → no reaction. (B) Ethanal: Structure: \(CH_3CHO\) This behaves like methyl ketone in haloform reaction → gives iodoform. (C) Benzophenone: No methyl ketone group → no reaction. (D) Benzaldehyde: Aromatic aldehyde → no iodoform test. (E) Phenol: No carbonyl → no reaction. Final Conclusion: \[ \boxed{\text{Ethanal gives iodoform test}} \]
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