AP EAMCET202120 Aug 2021Morning ShiftChemistryGeneral Organic ChemistryActual
The correct order of acidic strength among the following is
Options
- AFCH 2 CO 2 H > C 6 H 5 CO 2 H > CH 3 CH 2 CHClCO 2 H > CH 3 CO 2 H
- BC 6 H 5 CO 2 H > CH 3 CO 2 H > CH 3 CH 2 CHClCO 2 H > FCH 2 CO 2 H
- CCH 3 CH 2 CHClCO 2 H > FCH 2 CO 2 H > CH 3 CO 2 H > C 6 H 5 CO 2 H
- DFCH 2 CO 2 H > CH 3 CH 2 CHClCO 2 H > C 6 H 5 CO 2 H > CH 3 CO 2 H
Correct answer
D. FCH 2 CO 2 H > CH 3 CH 2 CHClCO 2 H > C 6 H 5 CO 2 H > CH 3 CO 2 H
Step-by-step solution
Acidity is directly proportional to the - I , - M effect. The - I effect of the fluorine atom is higher than the chlorine atom. So, the FCH 2 CO 2 H has more acidity than the CH 3 CH 2 CHClCO 2 H . The benzoic acid has more acidic strength than the acetic acid because phenyl group show the - I effect but methyl group will show the + I effect. So, the acidity order is :- FCH 2 CO 2 H > CH 3 CH 2 CHClCO 2 H > C 6 H 5 CO 2 H > CH 3 CO 2 H