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Which of the following IUPAC names is correct?
- a)2-Methyl-3-ethylpentane
- b)3-Ethyl-2-methylpentane
- c)2-Ethyl-3-methylpentane
- d)3-Methyl-2-ethylpentane
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
Which of the following IUPAC names is correct?a)2-Methyl-3-ethylpentan...
Option c is correct .
Because alphabetically Ethyl must get lower numbering than Methyl...
Because alphabetically Ethyl must get lower numbering than Methyl...
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Community Answer
Which of the following IUPAC names is correct?a)2-Methyl-3-ethylpentan...
Explanation:
Let's analyze each option and determine the correct IUPAC name.
Option A: 2-Methyl-3-ethylpentane
- This name suggests that there are two substituents on the pentane chain: a methyl group and an ethyl group.
- The numbering starts from the end closest to the substituents, so the methyl group is on carbon 2 and the ethyl group is on carbon 3.
- However, the correct IUPAC name should prioritize alphabetical order when naming substituents. Since "ethyl" comes before "methyl", the correct name would be "3-Ethyl-2-methylpentane" rather than "2-Methyl-3-ethylpentane".
Option B: 3-Ethyl-2-methylpentane
- This name suggests that there are two substituents on the pentane chain: an ethyl group and a methyl group.
- The numbering starts from the end closest to the substituents, so the ethyl group is on carbon 3 and the methyl group is on carbon 2.
- This name follows the alphabetical order of the substituents correctly, so it is the correct IUPAC name.
Option C: 2-Ethyl-3-methylpentane
- This name suggests that there are two substituents on the pentane chain: an ethyl group and a methyl group.
- The numbering starts from the end closest to the substituents, so the ethyl group is on carbon 2 and the methyl group is on carbon 3.
- However, this name does not follow alphabetical order for the substituents. The correct name would be "3-Ethyl-2-methylpentane" rather than "2-Ethyl-3-methylpentane".
Option D: 3-Methyl-2-ethylpentane
- This name suggests that there are two substituents on the pentane chain: a methyl group and an ethyl group.
- The numbering starts from the end closest to the substituents, so the methyl group is on carbon 3 and the ethyl group is on carbon 2.
- However, this name does not follow alphabetical order for the substituents. The correct name would be "3-Ethyl-2-methylpentane" rather than "3-Methyl-2-ethylpentane".
Therefore, the correct IUPAC name is 3-Ethyl-2-methylpentane.
Let's analyze each option and determine the correct IUPAC name.
Option A: 2-Methyl-3-ethylpentane
- This name suggests that there are two substituents on the pentane chain: a methyl group and an ethyl group.
- The numbering starts from the end closest to the substituents, so the methyl group is on carbon 2 and the ethyl group is on carbon 3.
- However, the correct IUPAC name should prioritize alphabetical order when naming substituents. Since "ethyl" comes before "methyl", the correct name would be "3-Ethyl-2-methylpentane" rather than "2-Methyl-3-ethylpentane".
Option B: 3-Ethyl-2-methylpentane
- This name suggests that there are two substituents on the pentane chain: an ethyl group and a methyl group.
- The numbering starts from the end closest to the substituents, so the ethyl group is on carbon 3 and the methyl group is on carbon 2.
- This name follows the alphabetical order of the substituents correctly, so it is the correct IUPAC name.
Option C: 2-Ethyl-3-methylpentane
- This name suggests that there are two substituents on the pentane chain: an ethyl group and a methyl group.
- The numbering starts from the end closest to the substituents, so the ethyl group is on carbon 2 and the methyl group is on carbon 3.
- However, this name does not follow alphabetical order for the substituents. The correct name would be "3-Ethyl-2-methylpentane" rather than "2-Ethyl-3-methylpentane".
Option D: 3-Methyl-2-ethylpentane
- This name suggests that there are two substituents on the pentane chain: a methyl group and an ethyl group.
- The numbering starts from the end closest to the substituents, so the methyl group is on carbon 3 and the ethyl group is on carbon 2.
- However, this name does not follow alphabetical order for the substituents. The correct name would be "3-Ethyl-2-methylpentane" rather than "3-Methyl-2-ethylpentane".
Therefore, the correct IUPAC name is 3-Ethyl-2-methylpentane.
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Which of the following IUPAC names is correct?a)2-Methyl-3-ethylpentaneb)3-Ethyl-2-methylpentanec)2-Ethyl-3-methylpentaned)3-Methyl-2-ethylpentaneCorrect answer is option 'B'. Can you explain this answer?
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