Propanal on treatment with dilute sodium hydroxide gives:

C H_{3} C H_{2} C H_{2} C H_{2} C H O

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C H_{3} C H_{2} C H (O H) C H_{2} C H_{2} C H O

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C H_{3} C H_{2} C H (O H) C H (C H_{3}) C H O

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C H_{3} C H_{2} C O O H

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Solution

The correct option is C $C H_{3} C H_{2} C H (O H) C H (C H_{3}) C H O$
Aldol condensation occurs in aldehydes having α-hydrogen with a dilute base to give β-hydroxy aldehydes called aldols. This reaction is most commonly known as aldol condensation.

Propanal on treatment with sodium hydroxide undergoes aldol reaction.
$2 C H_{3} - C H_{2} - C H O D i l . N a O H, 5^{o} C - --------- \to C H_{3} - C H_{2} - C H (O H) - C H (C H_{3}) - C H O$

Hence, option (c) is the correct answer.

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