Which of the following is the correct IUPAC name for 3-methyl-1-pentyne?

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Question: Which of the following is the correct IUPAC name for 3-methyl-1-pentyne?

Options:

Correct Answer: 3-methyl-1-pentyne

Solution:

The compound has a triple bond at the first carbon and a methyl group at the third carbon, making it 3-methyl-1-pentyne.

Which of the following is the correct IUPAC name for 3-methyl-1-pentyne?

Which of the following is the correct IUPAC name for 3-methyl-1-pentyne?

Step 1: Identify the longest carbon chain in the compound. In this case, the longest chain has five carbon atoms, which is called 'pent'.
Step 2: Determine the type of bond in the compound. Since there is a triple bond, we use 'yne' to indicate this.
Step 3: Number the carbon chain starting from the end closest to the triple bond. The triple bond is at the first carbon, so we call it '1-pentyne'.
Step 4: Identify any substituents (branches) on the carbon chain. There is a methyl group (–CH3) on the third carbon.
Step 5: Combine the information: The compound has a methyl group on the third carbon and a triple bond at the first carbon, so the full name is '3-methyl-1-pentyne'.

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