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JEE Advanced levelSingle correct optionDifficulty 3 of 3nm210

Esters of formula (structural isomers) are hydrolysed. How many of them give a secondary or a tertiary alcohol (as the alcohol component)?

  1. A2
  2. B4
  3. C3
  4. D5

Answer: C

There are 9 esters: methyl butanoate, methyl 2-methylpropanoate, ethyl propanoate, propyl ethanoate, isopropyl ethanoate, and four butyl methanoates (n-butyl, isobutyl, sec-butyl, tert-butyl). Alcohols from them: isopropyl (secondary) from isopropyl ethanoate, sec-butyl (secondary) and tert-butyl (tertiary) from the two butyl methanoates. Total 3.
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