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Relative Acid Strength III

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)
Cyclopentadiene structure with the acidic sp3 CH2 group highlighted Cycloheptatriene structure with the acidic sp3 CH2 group highlighted 1,3-Dithiane ring with the acidic CH2 between the two sulfur atoms highlighted Dimedone (5,5-dimethyl-1,3-cyclohexanedione) with acidic CH2 between the two carbonyls highlighted

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