Which of the following compound will give yellow precipitate with I2/Na2CO3 (aq.) but does not respond to Cannizzaro reaction?

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Which of the following compound will give yellow precipitate with $I_{2} / N a_{2} C O_{3}$ (aq.) but does not respond to Cannizzaro reaction?

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$C_{2} H_{5} C H_{2} O$

$C H_{2} O$

${(C_{2} H_{5})}_{2} C O$

$C H_{3} C H O$

answer is B.

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Detailed Solution

The iodoform reagents $I_{2} / N a_{2} C O_{3}$ are those which require 3-alpha-hydrogen atom attached to alpha-carbon atom to form iodoform with 3 replaceable atoms. Whereas Aldehyde with no alpha-hydrogen respond to Cannizzaro reaction.

Acetaldehyde ( $C H_{3} C H O$ ) satisfies conditions of iodoform (Yellow Ppt) test but due to presence of alpha-hydrogen Cannizzaro reaction is not shown.

Therefore, the correct answer is option (B) $C H_{3} C H O$ .

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