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Topic: Naming Alkenes & Alkynes (unsaturated hydrocarbons)

Topic: Naming Alkenes & Alkynes (unsaturated hydrocarbons). Do Now: Name the following. 1 st member is C 2 H 4: ethene H H C =C H H. Naming Alkenes. Count longest carbon chain prefix tells # of C ’ s in longest chain and add ‘ ene ’.

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Topic: Naming Alkenes & Alkynes (unsaturated hydrocarbons)

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  1. Topic: Naming Alkenes & Alkynes (unsaturated hydrocarbons) Do Now: Name the following

  2. 1st member is C2H4: ethene H H C=C H H Naming Alkenes • Count longest carbon chain • prefix tells # of C’s in longest chain and add ‘ene’

  3. 2. If more than 4 Carbons • give 1st carbon in double bond the lowest possible number when numbering the chain ] 1-butene 2-butene

  4. If 2 double bonds = diene 1,3 pentadiene

  5. Naming Branched-Chain Alkenes • 1st carbon in Double bond gets lowest number • Then name branches based on numbers assigned • Branch name and number come first when naming • Chain + ene come at the end • Example: 2-methyl 3-Nonene

  6. 3 methyl, 1-butene 4 3 2 1

  7. Naming Alkynes • Same as alkene just add ‘yne’ to the end instead

  8. H–CC–H C2H2 ethyne CHCH H H–CC–C–H H propyne C3H4 CHCCH3 CHCCH2CH3 1-butyne C4H6 C4H6 2-butyne CH3CCCH3 H H H–CC–C–C–H H H H H H–C–CC–C–H H H

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