The strongest acid is

Options

A. acetic acid
B. trichloracetic acid
C. dichloracetic acid
D. monochloroacetic acid

Answer

B

Explanation

Since, chloro group has - I effect. Due to which greater the number of electron withdrawing atoms (halogens ) , stronger will be the acid.
Thus, order of acidity is
` Cl - overset ( Cl) overset (|) underset (Cl) underset (| )C - COOH gt H - overset (Cl) overset (| )underset(Cl) underset(|)C - COOH gt `
trichloroacetic acid `" " ` dichloroacetic acid
`H - overset (Cl) overset(|)underset(H) underset(|)C - COOH gt H - overset(H)overset(|) underset(H)underset(|)C -COOH `
chloroacetic acid `" " ` acetic acid