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CHEMISTRY, M7 2018 VCE 1a

Organic compounds are numerous and diverse due to the nature of the carbon atom. There are international conventions for the naming and representation of organic compounds.

  1. Draw the structural formula of 2-methyl-propan-2-ol.   (1 mark)

  2. Give the molecular formula of but-2-yne.   (1 mark)

  1. Give the IUPAC name of the compound that has the structural formula shown above.   (1 mark)

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i.    
         

ii.    \(\ce{C4H6}\)

  • Structural or semi-structural formulas are not appropriate.
     

iii. •   Longest carbon chain is 6, hence hexane

  • Number carbons to give functional group lowest possible numbers: 2,3-dibromo, 4-methyl
  • Compound name: 2,3-dibromo-4-methylhexane

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i.    
         

ii.    \(\ce{C4H6}\)

  • Structural or semi-structural formulas are not appropriate.
     

iii.    Longest carbon chain is 6, hence hexane

  • Number carbons to give functional group lowest possible numbers: 2,3-dibromo, 4-methyl
  • Compound name: 2,3-dibromo-4-methylhexane
♦♦♦ Mean mark (c) 27%.

CHEMISTRY, M7 2016 VCE 2*

What is the correct systematic name for the compound shown above?   (2 marks)

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3,4-dimethylheptane

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  • 7 carbon string with single carbon and hydrogen bonds = heptane
  • Two methyl groups attached to carbon 3 and 4 (IUPAC convention)
  • Correct name is: 3,4-dimethylheptane

CHEMISTRY, M7 2023 HSC 3 MC

The structural formula of a compound is given.
 

What is the preferred IUPAC name of this compound?

  1. Pent-2-ene
  2. Pent-2-yne
  3. Pent-3-ene
  4. Pent-3-yne
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\(B\)

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  • The organic molecule has a 5-Carbon backbone, therefore the prefix will be “Pent”
  • The molecule contains no branches, so the rest of its name will be defined by the triple carbon bond “yne”
  • The rules of nomenclature state that the name must assign the triple carbon bond the lowest carbon number, this is achieved by numbering the carbons from right to left, placing the triple carbon bond at carbon 2
  • Hence the name of the compound is “Pent-2-yne”

\(\Rightarrow B\)

CHEMISTRY, M7 2021 HSC 24

A straight-chained alkane has a molar mass of 72.146 g mol ¯1.

Provide the structural formulae for this alkane and all of its isomers.

Name these molecules using IUPAC conventions.   (4 marks)

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Straight chained alkane (Pentane):

2-methylbutane:

2,2-dimethylpropane:

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Straight chained alkane (Pentane):

2-methylbutane:

2,2-dimethylpropane: