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Which of the following alkynes is the most acidic?

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Question: Which of the following alkynes is the most acidic?

Options:

  1. Ethylene
  2. Propyne
  3. Butyne
  4. Acetylene

Correct Answer: Acetylene

Solution: 

Acetylene (ethyne) is the most acidic among the given alkynes due to the sp hybridization of carbon.

Which of the following alkynes is the most acidic?

Practice Questions

Q1
Which of the following alkynes is the most acidic?
  1. Ethylene
  2. Propyne
  3. Butyne
  4. Acetylene

Questions & Step-by-Step Solutions

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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