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Q.

Which of the following compound will give yellow precipitate with I₂/NaOH and undergoes aldol condensation

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a

$C_{6} H_{5} - CHO$

b

$C_{6} H_{5} - {CH}_{2} - CHO$

c

${CH}_{3} - CHO$

d

HCHO

answer is D.

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Detailed Solution

When Iodine and sodium hydroxide are added to a compound that contains either a methyl ketone or a secondary alcohol with a methyl group in the alpha position, a pale yellow precipitate of iodoform or triiodomethane is formed.
It can be used to identify aldehydes or ketones.

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