Which of the following alkynes is the most acidic?

Which of the following alkynes is the most acidic?

Step 1: Understand what alkynes are. Alkynes are hydrocarbons that contain at least one triple bond between carbon atoms.
Step 2: Know that acidity in organic compounds is often related to the hybridization of the carbon atoms involved in the acidic hydrogen.
Step 3: Recognize that sp hybridized carbons (like those in acetylene) hold their electrons more tightly than sp2 or sp3 hybridized carbons.
Step 4: Identify acetylene (ethyne) as the simplest alkyne, which has the formula C2H2 and consists of two sp hybridized carbons.
Step 5: Compare acetylene with other alkynes. Alkynes with sp2 or sp3 hybridized carbons will be less acidic than those with sp hybridization.
Step 6: Conclude that since acetylene has sp hybridization, it is the most acidic among the alkynes.

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