Question

Rank the following compounds in increasing order of their acidity:
1. 3-fluorobutanoic acid
2. 3-chlorobutanoic acid
3. 2-fluorobutanoic acid
4. Butanoic acid
5. 4-chlorobutanoic acid.

• A. 3 < 1 < 2 < 4 < 5
• B. 4 < 3 < 1 < 2 < 5
• C. 5 < 2 < 1 < 3 < 4
• D. 4 < 5 < 2 < 1 < 3

Answer 1

Answer: (D)

Smaller the distance and higher the electronegativity of halogen, greater the -I effect, stronger the acid