The name of the side group in this molecule is

• ethyl
  

• methyl

• propyl

• no-side group

Which of the following pairs of molecules could be structural isomers?

• 2-methylbutane and 2,2-dimethylpropane

• 2-methylpropane and pentane

When numbering carbons in an unsaturated hydrocarbon

• alkyl groups are prioritised

• carbon to carbon double bonds are prioritised

The molecules shown have

• the same IUPAC names
  

• different IUPAC names

The semi-structural formula for the molecule shown is

• CH₃CH₂CH₂CH₂CH₃

• CH₃CH₂CH₂CH₃

Which of the following options has the parent names associated with the correct number of carbon atoms in the carbon chain

• Pent-: 5, Oct-: 8, Prop-: 4

• Pent-: 3, Oct-: 8, Prop-: 5

• Pent-: 3, Oct-: 7, Prop-: 5

• Pent-: 5,: Oct-: 8, Prop-: 3

Which of the following is the correct IUPAC name of the molecule shown?

• 2-ethylpent-4-ene

• 4-ethylpent-1-ene

• 4-methylhexane

• 3-methylhexane

What is the correct systematic name for the compound shown?

• 4-methyl-5-ethylhexane

• 2-ethyl-3-methylhexane

• 4,5-dimethylheptane

• 3,4-dimethylheptane

What is the correct systematic name for the compound shown?

• 2-ethyl-3-methylpentane
  

• 3-methyl-4-ethylpentane
  

• 3,4-dimethylhexane
  

• 2,3-diethylbutane
  

Answer explanation

Consider the following structures. Which of these structures is that of 2,2,4-trimethylpentane?

• I and III only

• I and IV only

• II and III only

• II and IV only