Q.

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

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a

C6H5CHO

b

C6H5CH2CHO

c

CH3CHO

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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