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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3nm052

Consider . Which of the following statements is/are correct?

  1. AThe parent chain is heptane and it carries three substituents.
  2. BThe locant set of the substituents is {2,3,5}.
  3. CThe correct IUPAC name is 2,5-dimethyl-3-ethylheptane.
  4. DA seven-carbon chain through the ethyl group is also possible, but it is not chosen because it carries fewer substituents.

Answer: A, B, D

The longest chain has seven carbons; one seven-carbon chain carries three substituents (two methyls and an ethyl) and another, through the ethyl group, carries only two (isopropyl and methyl), so the first is chosen. Numbering from the isopropyl end gives {2,3,5}, lower than {3,5,6}. The name is 3-ethyl-2,5-dimethylheptane; writing methyl before ethyl breaks alphabetical order. Statements 1, 2 and 4 are correct.
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