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What is the molecular formula of 2-butyne?

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Question: What is the molecular formula of 2-butyne?

Options:

  1. C4H6
  2. C4H8
  3. C4H10
  4. C4H4

Correct Answer: C4H6

Solution: 

2-butyne has a triple bond and contains 4 carbons and 6 hydrogens, giving the formula C4H6.

What is the molecular formula of 2-butyne?

Practice Questions

Q1
What is the molecular formula of 2-butyne?
  1. C4H6
  2. C4H8
  3. C4H10
  4. C4H4

Questions & Step-by-Step Solutions

What is the molecular formula of 2-butyne?
  • Step 1: Identify the name of the compound, which is 2-butyne.
  • Step 2: Understand that 'butyne' indicates it is a butyne, meaning it has 4 carbon atoms (C).
  • Step 3: Recognize that the '2-' prefix indicates the position of the triple bond in the carbon chain.
  • Step 4: Count the number of hydrogen atoms. For a triple bond, the formula is CnH(2n-2). Here, n = 4 (for 4 carbons).
  • Step 5: Calculate the number of hydrogens: H = 2(4) - 2 = 8 - 2 = 6.
  • Step 6: Combine the number of carbons and hydrogens to write the molecular formula: C4H6.
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