QUIZ ORGANIC CHEMISTRY

Crude oil is a mixture of a large number of compounds most of which are hydrocarbons such as

the molecule shown below.

i. What is a Hydrocarbons_______?

ii. What is the chemical formula of the molecule shown above?

Alkanes are hydrocarbons found in crude oil. Hydrocarbons contain the elements_________and_________only.

Alkanes are hydrocarbons with the general formula

• CnHn

• CnH2n

• CnH2n+2

Describe and explain how crude oil is separated into fractions by fractional distillation?

Dodecane (C12H26) from crude oil is cracked to produce ethene (C2H4).

(i) Complete the equation for this reaction above

C12H26 --------> 2C2H4 + _________

Give two conditions needed for cracking.

________ and ________

Propane (C3H8) is used as a fuel.

Complete the equation for the complete combustion of propane.

C3H8 + 5O2 ------> 3______ + 4_______

iExplain why C8H18 has a lower boiling point than C14H30

A molecule of ethene (C2H4) is represented above.

A sample of ethene is shaken with bromine water.

Complete the sentence.

The bromine water turns from orange to _________