Which of the following pairs of compounds can be distinguished by iodoform test performed in ammonium hydroxide?
Show Hint
- CH\(_3\)COCH\(_3\) and C\(_2\)H\(_5\)OH
- C\(_2\)H\(_5\)OH and CH\(_3\)OH
- CH\(_3\)COCH\(_3\) and C\(_6\)H\(_5\)COCH\(_3\)
- C\(_6\)H\(_5\)COCH\(_3\) and C\(_2\)H\(_5\)OH
The Correct Option is A, D
Solution and Explanation
Step 1: Understanding the iodoform test.
The iodoform test is used to detect compounds that contain a methyl group directly attached to a carbonyl group, such as ketones or alcohols with the structure \( \text{R-COCH}_3 \). The presence of a yellow precipitate of iodoform (\( CHI_3 \)) indicates a positive result.
Step 2: Analyzing the options.
(A) CH\(_3\)COCH\(_3\) and C\(_2\)H\(_5\)OH: Correct — Acetone (CH\(_3\)COCH\(_3\)) will give a positive iodoform test, but ethanol (C\(_2\)H\(_5\)OH) will not.
(B) C\(_2\)H\(_5\)OH and CH\(_3\)OH: Incorrect — Neither ethanol nor methanol will give a positive iodoform test.
(C) CH\(_3\)COCH\(_3\) and C\(_6\)H\(_5\)COCH\(_3\): Incorrect — Both acetone and acetophenone will give a positive iodoform test.
(D) C\(_6\)H\(_5\)COCH\(_3\) and C\(_2\)H\(_5\)OH: Correct— Only acetophenone will give a positive iodoform test.
Step 3: Conclusion.
The correct answer is:
(A) CH\(_3\)COCH\(_3\) and C\(_2\)H\(_5\)OH
(D) C\(_6\)H\(_5\)COCH\(_3\) and C\(_2\)H\(_5\)OH
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