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The number of primary amines (structural isomers) of formula is

  1. A1
  2. B3
  3. C2
  4. D4

Answer: C

Primary amines R-NH2 with R = propyl: propan-1-amine and propan-2-amine, so 2. (The total for is 4: also N-methylethanamine and N,N-dimethylmethanamine.)
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