Relative Strength of Carbon Acids

In each of the following sections four compounds are listed. The most acidic C-H protons are colored. In the box under each formula enter a number (1 to 4) indicating the order of acid strength.
(1 is strongest & 4 is weakest).
Note that C6H5- represents a phenyl group.

(A)
CH2(CO2C2H5)2 CH3COCH2CO2C2H5 (CH3CO)2CH2 RC≡CH
(B)
RCH2NO2 RSO2CH3 (C6H5)3CH RCOCH3
(C)
CH2(C≡N)2 CH2(NO)2 HC≡N RCH2CO2C2H5
(D)
      
For a brief discussion of each problem click the appropriate button:        
This script written by William Reusch, Dept. of Chemistry, Michigan State University. Please send comments and corrections to whreusch@pilot.msu.edu.