COMEDK20269 May 2026Evening ShiftChemistryAldehydes and KetonesActual
Match the reactions in List I with the final products formed as given in List II. List I List II W C ₆ H ₅ CH ₃ (i) CrO ₃ + ( CH ₃ CO )₂ O ; (ii) H ₂ O + heat P R ₂ CO X RCOOC ₂ H ₅ (i) DIBAL-H ; (ii) H ₂ O Q C ₆ H ₅ COCH ₃ Y RCN (i) R-Mg-X /dry ether ; (ii) H ₃ O ^+ R C ₆ H ₅ CHO Z C ₆ H ₅ COCl + ( CH ₃)₂ Cd in dry ether S RCHO
Options
- AW - R X - P Y - Q Z - S
- BW - Q X - P Y - S Z - R
- CW - S X - R Y - Q Z - P
- DW - R X - S Y - P Z - Q
Correct answer
D. W - R X - S Y - P Z - Q
Step-by-step solution
Reaction W: Toluene ( C ₆ H ₅ CH ₃ ) reacts with chromic oxide ( CrO ₃ ) in acetic anhydride to form benzylidene diacetate, which on hydrolysis yields benzaldehyde ( C ₆ H ₅ CHO ). Thus, W matches with R. Reaction X: Esters ( RCOOC ₂ H ₅ ) are reduced by DIBAL-H to aldehydes ( RCHO ). Thus, X matches with S. Reaction Y: Nitriles ( RCN ) react with Grignard reagents ( RMgX ) to form an imine complex, which upon acid hydrolysis yields a ketone ( R ₂ CO ). Thus, Y matches with P. Reaction Z: Acid chlorides ( C ₆ H ₅ C