H Chem Unit 2 N5 Hydrocarbons Revision quiz 1

A homologous series is a family of molecules which have the same ________(1)________formula, similar _______(2)_________ properties and show a regular/predictable change in their ________(3)_________ properties.

What are the correct missing words?

• (1) = molecular, (2) = chemical, (3) = physical

• (1) = molecular, (2) = physical, (3) = chemical

• (1) = general, (2) = chemical, (3) = physical

• (1) = general, (2) = physical, (3) = chemical

• 2-methylhexane

• 2-methylheptane

• 5-methylhexane

• 5-methylheptane

Which of these molecules is 2,4-dimethylpentane?

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• 
• 
• 

Which two of these molecules are isomers?

• 
• 
• 
• 

Which of the following is the correct definition of isomers?

• molecules with the same general formula but a different molecular formula

• molecules with the same general formula but a different structural formula

• molecules with the same molecular formula but a different structural formula

What is the systematic name of this molecule?

• 4-ethyl-7-methyloctane

• 7-methyl-4-ethyloctane

• 2-methyl-5-ethyloctane

• 5-ethyl-2-methyloctane

How many methyl branches are present in this molecule?

• 0

• 1

• 2

• 3

What is the general formula of the alkenes?

• C_nH_2n

• C_2nH_n

• C_nH_2n+2

• C_nH_2n-2

What is the general formula of the alkanes?

• C_nH_2n

• C_2nH_n

• C_nH_2n+2

• C_nH_2n-2

Which two of these homologous series have the same general formula?

• alkanes

• alkenes

• alkynes

• cycloalkanes