Hydrocarbons

Which element must be present in all organic molecules?

• Hydrogen

• Oxygen

• Nitrogen

• Carbon

Which element can form single double or triple bonds with other atoms of the same element?

• Fluorine

• Hydrogen

• Carbon

• Oxygen

The atoms of which element bond to one another in chains, rings and networks?

• Barium

• Carbon

• Iodine

• Mercury

Which organic prefix is matched with the number of carbon atoms it represents?

• non, 8

• pent, 3

• hept, 7

• prop, 4

How many electrons are shared in a Carbon-Carbon single bond?

• 1

• 2

• 4

• 6

How many electrons are shared in a Carbon-Carbon double bond?

• 1

• 2

• 4

• 6

How many electrons are shared in a Carbon-Carbon triple bond?

• 1

• 2

• 4

• 6

The only two elements present in alkanes, alkenes and alkynes are

• Carbon and Hydrogen

• Oxygen and Carbon

• Carbon and nitrogen

• Oxygen and Nitrogen

Which formula represents a hydrocarbon?

• C2H6O

• C2H6

• C2H5OH

• C2H5Cl

Answer explanation

Hydrocarbons contain only the elements Carbon and Hydrogen

Which of the following formulas represents an alkane?

• C2H4

• C3H4

• C3H8

• C2H2

Answer explanation

In an alkane for every n carbons, we have 2n+2 Hydrogens present