Treatment of propionaldehyde with dilute $N a O H$ solution gives

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

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

$C H_{3} C H_{2} C O O C H_{2} C H_{2} C H_{3}$

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

answer is B.

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Detailed Solution

When Propionaldehyde is treated with dil. $N a O H$ it goes under aldol condensation reaction. This reaction initially involves the formation of the enolate ion which attacks another mole of the aldehyde to form the beta-hydroxy aldehyde.

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Hence, the correct answer is option (B) $C H_{3} C H_{2} C H (O H) C H (C H_{3}) C H O$ .

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