Question

1. Double bonds are the only type of unsaturation observed in hydrocarbons.

True

False

2. Hydrogenation increases a hydrocarbon's degree of unsaturation.

True

False

3. Margarine has a lower degree of unsaturation than a liquid cooking oil, such as olive oil.

True

False

4.

Oil, gasoline, and natural gas are all examples of:

Hydrocarbons.

Carbohydrates.

Pure substances.

Aromatic compounds.

5.Hydrocarbons are nonpolar, meaning they interact with one another via which intermolecular force?

London Dispersion.

Dipole-Dipole.

Hydrogen bonding.

Covalent bonding.

Answer 1

1)False

Explanation:

Hydrocarbons are those which have carbon and hydrogen in skeletal structure. The unsaturation in hydrocarbons can be double bond or triple bond, ie, carbon can make double bond or triple bond with another carbon.

2) False

Explanation:

Hydrogenation is a reaction process which is done to add hydrogens to the unsaturated carbon-carbon double or triple bond. Hydrogenation make the hydrocarbon more saturated. Degree of unsaturation is the extend of unsaturation in a hydrocarbon. So as unsaturation increases, degree of unsaturation increases and vice versa. So hydrogenation which decrease the unsaturation in a hydrocarbon will decrease the degree of unsaturation.

3) True

Explanation:

Cooking oil like olive oil are unsaturated oils and thus they are liquid at room temperature. Margarine which is solid at room temperature contains less unsaturation compared to oilve oil. This is because, the manufacturers of margarine hydrogenates some of its unsaturation to make it solid in room temperature.

4)Oil, gasoline, and natural gas are all examples of hdrocarbons.

Explanation:

They contains carbon and hydrogen saturated and unsaturated skeleton. So broadly saying, they are hydrocarbons.

They are not carbohydrates since carbohydrates are biomolecules containing carbon, hydrogen and oxygen which is included in fruits, sugar, etc.

They are not pure substances because they can be mixtures.

They can`t be categorized into aromatic compounds because all of them need not be aromatic.

5) London Dispersion

Explanation :

London force is the weakest attractive temporary force which exerts due to the change in electron position in adjacent atoms. This can be seen in hydrocarbons.