Which carbon acid should have the LOWEST #pK_a#?

#(A)# #CH_4#;
#(A)# #H_3C-CH_3#;
#(C)# #C_5H_6#;
#(D)# #C_6H_6#.

1 Answer
anor277
Aug 26, 2017

#"Option C"#

Explanation:

Cyclopentadienyl anion is resonance stabilized, and thus the #pK_a# of cyclopentadiene is reduced substantially in comparison to the other examples. Anyway, as a chemist, as a physical scientist, you should look at the data. Here is a start.

The more positive the #pK_a# the WEAKER the ACID.

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