JEE Main20266 April 2026Evening ShiftChemistryAldehydes and KetonesActual
' x ' is the product which is obtained by the hydrolysis of prop-1-yne in the presence of mercuric sulphate under dilute acidic medium at 333 K. ' y ' is the product which is obtained by the reaction of ethane nitrile with methyl magnesium bromide in dry ether followed by hydrolysis. IUPAC name of product obtained from ' x ' and ' y ' in the presence of barium hydroxide followed by heating is :
Options
- A2-Methylpent-4-en-3-one
- B4-Methylpent-3-en-2-one
- C4-Methylpent-1-ene
- D2-Methylpent-3-one
Correct answer
B. 4-Methylpent-3-en-2-one
Step-by-step solution
Hydrolysis of prop-1-yne in the presence of HgSO₄ and dilute H₂SO₄ yields acetone. CH₃-C CH + H₂O Hg²⁺, H^+ CH₃-CO-CH₃ Thus, x is acetone. Reaction of ethane nitrile ( CH₃CN ) with methyl magnesium bromide ( CH₃MgBr ) followed by hydrolysis also yields acetone. CH₃-C N + CH₃MgBr CH₃-C(CH₃)=NMgBr H₃O^+ CH₃-CO-CH₃ Thus, y is acetone. Reaction of x and y (both acetone) in the presence of Ba(OH)₂ followed by heating results in an aldol condensation. 2 CH₃-CO-CH₃ Ba(OH)₂ CH₃-C(OH)(CH₃)-CH₂-CO-CH₃ Heating causes dehydrat