Chemistry grade 12 midterm exam

The relationship between numbers of carbon and hydrogen atoms in cycloalkanes can be expressed as

• CnH2n+2

• CnH2n

• CnH2n-2

• There is no relationship between the number of carbon and hydrogen atoms in alkanes

What is name of this organic compound in the IUPAC system

• 1-Butyne

• 2-Butane

• 3-Butyne

• 3-Butene

Which of the following is an example of an organic compound?

• Water

• table salt

• carbon dioxide

• Heptane

Which of the following elements do hydrocarbons contain?

• carbon and oxygen only

• carbon and hydrogen only

• carbon, hydrogen, and oxygen

• nitrogen, phosphorus, oxygen, sulfur, and the halogens

What is true of an unsaturated hydrocarbon?

• It has only single bonds.

• It has only double bonds.

• It has no single bonds.

• It has either double or triple bond.

For alkynes, the relationship between the numbers of carbon and hydrogen atoms can be expressed as

• CnH2n+2

• CnH2n

• CnH2n-2

• There is no relationship between the number of carbon and hydrogen atoms in alkanes

The structural formula of 1,3-pentadiene is

• CH2=CHCH=CHCH2

• CH2=CHCHCHCH3

• CH2=CHCH=CHCH3

• CHCHCH=CHCH3

This condensed structural formula CH3CH2CH2CH2CH3 for which compound

• Propane

• Hexane

• Methane

• Pentane

The name of this cycloalkane is

• Methane

• Cyclopropane

• Decane

• Cyclohexane

Unsaturated hydrocarbon that contains one or more double covalent bonds between carbon atoms in a chain

• Alkanes

• Alkynes

• Alkenes

• Alkyles