COMEDK202510 May 2025Morning ShiftChemistryAldehydes and KetonesActual
Which one of the following reactions does not give the correct combination of reactants and the major products formed in the reaction?
Options
- ACH ₃ CHO +2 C ₂ H ₅ OH ( dry HCl gas ) CH ₃- CH - ( OC ₂ H ₅ )₂
- BC ₆ H ₅- CO _ - CH ₃+ I ₂+ Na ₂ CO ₃( Heat ) CHI ₃+ C ₆ H ₅ COO ⁻
- CCH ₃- CO - CH ₃+ NH ₂- NH - CO - NH ₂( weakly basic ) ( CH ₃ )₂ C = N - NH - CO - NH ₂
- DCH ₃- CH = CH - CH ₂- CH ₂- CN [ (ii). H ₂ O ] (i). DIBAL - H CH ₃- ( CH ₂ )₄- CHO
Correct answer
D. CH ₃- CH = CH - CH ₂- CH ₂- CN [ (ii). H ₂ O ] (i). DIBAL - H CH ₃- ( CH ₂ )₄- CHO
Step-by-step solution
Option (8BNT6): Acetaldehyde reacts with ethanol in the presence of dry HCl gas to form an acetal, CH ₃ CH ( OC ₂ H ₅)₂ . This is a correct reaction. Option (kuGqc): Acetophenone contains a methyl ketone group, which undergoes the iodoform reaction with I ₂ and Na ₂ CO ₃ to produce CHI ₃ and the benzoate salt C ₆ H ₅ COO ^- . This is a correct reaction. Option (ZY1se): Acetone reacts with semicarbazide in a weakly basic medium to form the corresponding semicarbazone, ( CH ₃)₂ C = N - NH - CO - NH ₂ . This is a corr