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JEE Main levelSingle correct optionDifficulty 2 of 3nm238

The compound shown is one of four isomeric esters of the same molecular formula. What is its IUPAC name?

  1. A2-methylpropyl ethanoate
  2. Bethyl 2-methylpropanoate
  3. Cethyl butanoate
  4. Dpropan-2-yl propanoate

Answer: B

The compound is ethyl 2-methylpropanoate. The acyl part (from the acid) is a 3-carbon chain carrying a methyl at C2, and the group on oxygen is ethyl. The other three names describe isomeric esters with a different acyl/alkyl split.
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