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JEE Main202623 January 2026Morning ShiftChemistryAldehydes and KetonesActual

' x ' is the product which is obtained from propanenitrile and stannous chloride in the presence of hydrochloric acid followed by hydrolysis. ' y ' is the product which is obtained from the but-2-ene by the ozonolysis followed by hydrolysis. From the following, which product is not obtained when one mole of ' x ' and one mole of ' y ' react with each other in the presence of alkali followed by heating?

Options

  1. A2-Methylpent-2-enal
  2. BPent-2-enal
  3. C2-Methylbut-2-enal
  4. D3-Methylbut-2-enal

Correct answer

D. 3-Methylbut-2-enal

Step-by-step solution

Product x is obtained by the Stephen reduction of propanenitrile ( CH₃CH₂CN ). CH₃CH₂CN SnCl₂/HCl CH₃CH₂CH=NH H₂O CH₃CH₂CHO (Propanal). Product y is obtained by the reductive ozonolysis of but-2-ene ( CH₃CH=CHCH₃ ). CH₃CH=CHCH₃ O₃, H₂O/Zn 2CH₃CHO (Ethanal). When propanal ( x ) and ethanal ( y ) react in the presence of alkali followed by heating, they undergo cross-aldol condensation. Possible products are: 1. Self-aldol of propanal: CH₃CH₂CHO + CH₃CH₂CHO CH₃CH₂CH=C(CH₃)CHO (2-Methylpent-2-enal). 2. Self-aldol of e

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