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The IUPAC name of allylamine is

  • A.But-2-en-1-amine
  • B.But-1-en-2-amine
  • C.Prop-2-en-1-amine
  • D.Prop-1-en-2-amine
  • E.2-Amino 1-propene

Answer: C

The IUPAC name is Prop-2-en-1-amine.

The allyl group is CH2=CH-CH2-, so allylamine is CH2=CH-CH2-NH2. Number the three-carbon chain from the end bearing the amino group, which takes priority: NH2 on C-1 and the double bond between C-2 and C-3.

Prop-1-en-2-amine would put the amino group on the middle carbon, and the butene names have one carbon too many. '2-Amino 1-propene' is not IUPAC style, which names the amine as the suffix.

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