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JEE Main levelSingle correct optionDifficulty 2 of 3nm141

The number of secondary amines among the structural isomers of is

  1. A3
  2. B2
  3. C4
  4. D5

Answer: A

Secondary amines have the form R-NH-R'. With 4 carbons: methyl + n-propyl, methyl + isopropyl, and ethyl + ethyl. That is 3 structural isomers (checked by enumeration), distinct from the 4 primary and 1 tertiary amines.
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