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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3nm230

Which of the following statements about the compound shown are correct? Follow NCERT-style rules.

  1. AThe parent chain is hexane.
  2. BThe lowest locant set for the substituents is 2,3,4,4.
  3. CThe set 3,3,4,5 is lower than 2,3,4,4 and is therefore preferred.
  4. DThe molecular formula is and the compound has a quaternary carbon.

Answer: A, B, D

The compound is 2,3,4,4-tetramethylhexane (C10H22). The six-carbon chain carries four methyl groups; numbering from the end nearer the branches gives {2,3,4,4}, which beats {3,3,4,5} at the first point of difference (2 < 3). The carbon with two methyls and the ethyl-bearing neighbour is a quaternary carbon.
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