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Q.

Two isomeric ketones, 3–pentanone and 2–pentanone can be distinguished by :

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a

NaSO3H

b

2, 4–DNP

c

I2/NaOH

d

NaCN/HCl

answer is A.

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Detailed Solution

  • 2- pentanone is a methyl ketone. It undergoes haloform reaction with iodine in presence of sodium hydroxide, to form yellow precipitate of iodoform. 
  • 3- pentanone is not a methyl ketone. It does not undergo haloform reaction. Hence, 3- pentanone and 2- pentanone can be distinguished by reaction with iodine in presence of NaOH.
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