Alcohols Worksheet - Answer Key

  1. The common name for an alcohol consists of the name of the alkyl group to which the OH group is attached, followed by the word “alcohol”.

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  2. The systematic name of an alcohol is obtained by replacing the “e” at the end of the name of the parent hydrocarbon with the suffix “ol”.

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  3. The parent hydrocarbon is the longest continuous chain containing the functional group.
    • Name:            1 – pentanol

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  4. The parent hydrocarbon is numbered in the direction that gives the functional group the lowest possible number.
    • Name:            3 – hexanol

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  5. If there is a functional group suffix and a substituent, the functional group suffix gets the lowest possible number.
    • Name:            4 - methylcyclohexanol

       

      It is not necessary to include the “1” for the alcohol position.  Because functional groups take priority when naming it is assumed that it is in the first position.

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  6. If counting in either direction gives the same number for the functional group suffix, the chain is numbered in the direction that gives a substituent the lowest possible number.
    • Name:            2,5 – dimethyl – 4 – heptanol

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  7. If there is more than one OH functional group use prefixes to indicate the number.
    1. Name: 2 , 4 – hexanediol

     

     

     

  8. What is a primary, secondary and tertiary alcohol?

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  9. Give the systematic name for the following and indicate whether it is primary, secondary or tertiary.

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    1. 5 – chloro – 2 – methyl – 2 – pentanol
      tertiary


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    2. 4 – bromo – 3 – ethylcyclohexanol
      secondary


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    3. 2, 3 – dimethyl – 1 – butanol
      primary

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