COMEDK202510 May 2025Evening ShiftChemistryCarboxylic Acid DerivativesActual
Choose the incorrect statement from the following.
Options
- AAcetic acid does not reduce Fehling's solution
- BAcetic acid gives effervescence with aqueous NaHCO ₃ solution
- CAcetic acid on reaction with HI and red P at 473 K gives iodoethane
- DAcetic acid is a weaker acid than formic acid
Correct answer
C. Acetic acid on reaction with HI and red P at 473 K gives iodoethane
Step-by-step solution
(1) Correct: Acetic acid lacks an aldehyde group, so it does not reduce Fehling's solution. (2) Correct: Acetic acid reacts with NaHCO₃ releasing CO₂ , causing effervescence: CH₃COOH + NaHCO₃ CH₃COONa + H₂O + CO₂ (3) Incorrect: Red P/HI reduces carboxylic acids all the way to the corresponding alkane, not a haloalkane. Acetic acid gives ethane, not iodoethane: CH₃COOH Red P/HI, CH₃CH₃ (4) Correct: The +I effect of the methyl group in acetic acid destabilises the acetate ion compared to the formate ion, making aceti