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Question

The IUPAC name of the compound CHCCH2CH2CH=CH2 is:
  1. Hex-1-en-5-yne
  2. Hexyn-5-ene
  3. Hex-5-en-2-yne
  4. Hex-5-en-1-yne

A
Hex-1-en-5-yne
B
Hexyn-5-ene
C
Hex-5-en-2-yne
D
Hex-5-en-1-yne
Solution
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CHCCH2CH2CH=CH2

IUPAC name: Hex-1-en-5-yne.

Numbering starts from the double bond bearing carbon, as alkenes are higher priority functional groups than alkynes (triple bond).

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