# Chapter 3 - Acid-Base Reactions - 3.5 Ranking The Four Factors - Problems - Page 69: 3.31

The compound on the left is more acidic.

#### Work Step by Step

- The only difference between the structures is the triple bond. - One of the carbons in the triple bond is $sp$ hybridized. - A negative charge on an $sp$ atom is more stable than one in an $sp^2$ atom (from the double bond in the structure on the right). - Therefore, the compound on the left is more acidic.

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