Alkanes Quiz

Which statement about alkanes is correct?

• Ethane reacts with chlorine in an addition reaction.

• Propane has a higher boiling point than butane.

• The molecule of the alkane that contains 99 carbon atoms has 200 hydrogen atoms.

• There are three isomers with the formula C4H10.

Which is a correct definition of isomers?

• atoms with the same relative atomic mass and different structures

• compounds with the same molecular formula and different structures

• compounds with the same molecular mass and different structures

• elements with the same molecular mass and the same structures

Which statement about the properties of propane and hexane is correct?

• Propane has a higher boiling point than hexane.

• Propane has a higher relative molecular mass than hexane.

• Propane has more isomers than hexane.

• Propane is more flammable than hexane.

Methane is the first member of the alkane series of hydrocarbons. The second member is ethane. Which statements about ethane are correct?

• Ethane has the formula C2H4.

• Ethane has a higher boiling point than that of methane.

• Ethane has the same molecular formula as methane.

• Ethane has chemical properties very similar to those of methane.

Which alkane, when any one hydrogen atom is substituted by a chlorine atom, will not produce isomers?

The diagram shows two compounds. It can be predicted from their formulae that the compounds have the same

• boiling point.

• composition by mass.

• melting point.

• structural formula.

Which statement concerning isomers is true?

• Diamond and graphite are isomers of each other.

• Isomers have the general formula CnH2n+2.

• Isomers have the same molecular formula.

• Macromolecules are isomers of the small molecules from which they are made.

Compounds X and Y are both alkanes. Compound X has a higher boiling point than compound Y. What could be the formulae of compounds X and Y?

• C8H16 and C9H18

• C8H18 and C9H20

• C9H18 and C8H16

• C9H20 and C8H18

Which hydrocarbons are isomers of each other?

• 1, 2 and 3

• 1, 2 and 4

• 1 and 2 only

• 3 and 4

Which structures represent identical molecules?

• 1 and 3 only

• 2 and 3 only

• 1, 3 and 4 only

• 1, 3 and 5 only