What is the correct decreasing order for acid strength?

Question

What is the correct decreasing order for acid strength? (A) NO2CH2COOH>FCH2COOH>CNCH2COOH>ClCH2COOH (B) NO2CH2COOH>NCCH2COOH>FCH2COOH>ClCH2COOH (C)  CNCH2COOH>O2NCH2COOH>FCH2COOH>ClCH2COOH (D) FCH2COOH>NCCH2COOH>NO2CH2COOH>ClCH2COOH

Tardigrade Admin · Accepted Answer

Acidic character propto stability of conjugate base (anion) Stability of anion propto - textI Hence greater the -I effect greater will be the acidity Order of -I effect -NO2>CN>-F>-Cl Hence, the order of acidity (ka) will be textO2 textNCH2 textCOOH > textNCCH2 textCOOH > textFCH2 textCOOH > textCl CH2 textCOOH

Q. What is the correct decreasing order for acid strength?

$N O_{2} C H_{2} COO H > FC H_{2} COO H > CNC H_{2} COO H > ClC H_{2} COO H$

$N O_{2} C H_{2} COO H > NCC H_{2} COO H > FC H_{2} COO H > ClC H_{2} COO H$

$CNC H_{2} COO H > O_{2} NC H_{2} COO H > FC H_{2} COO H > ClC H_{2} COO H$

$FC H_{2} COO H > NCC H_{2} COO H > N O_{2} C H_{2} COO H > ClC H_{2} COO H$

Q. What is the correct decreasing order for acid strength?

NO2​CH2​COOH>FCH2​COOH>CNCH2​COOH>ClCH2​COOH

NO2​CH2​COOH>NCCH2​COOH>FCH2​COOH>ClCH2​COOH

CNCH2​COOH>O2​NCH2​COOH>FCH2​COOH>ClCH2​COOH

FCH2​COOH>NCCH2​COOH>NO2​CH2​COOH>ClCH2​COOH

Acidic character ∝ stability of conjugate base (anion) Stability of anion ∝−I Hence greater the −I effect greater will be the acidity Order of −I effect −NO2​>CN>−F>−Cl Hence, the order of acidity (ka​) will be O2​NCH2​COOH>NCCH2​COOH>FCH2​COOH>Cl CH2​COOH

$N O_{2} C H_{2} COO H > FC H_{2} COO H > CNC H_{2} COO H > ClC H_{2} COO H$

$N O_{2} C H_{2} COO H > NCC H_{2} COO H > FC H_{2} COO H > ClC H_{2} COO H$

$CNC H_{2} COO H > O_{2} NC H_{2} COO H > FC H_{2} COO H > ClC H_{2} COO H$

$FC H_{2} COO H > NCC H_{2} COO H > N O_{2} C H_{2} COO H > ClC H_{2} COO H$