Pre-test Hydrocarbons

Which ONE of the following terms describes hydrocarbons that contain only single bonds?

• Isomers

• Saturated

• Unsaturated

• Homologous series

Which ONE of the following compounds in solution will change the colour of bromothymol blue?

• CH₃CH₂CHO

• CH₃CH₂COOH

• CH₃CH₂COCH₃

• CH₃CH₂COOCH₃

Which ONE of the following compounds in solution will change the colour of bromothymol blue?

• hydrogen (H2)
• nitrogen (N2)
• oxygen (O2)
• carbon dioxide (CO2)

Which formula shows the way in which atoms are bonded in a molecule but does not show all the bond lines?

• molecular formula
• structural formula
• condensed structural formula
• empirical formula

To which homologous series does a compound with molecular formula C₆H₁₂O₂ belong?

• Aldehydes
• Carboxylic acids

• Esters
• Alcohols

When CH2 = CH2 is converted to CH₃CH₃, the type of reaction is …

• 
• 
• 
• 

Which ONE of the following compounds has the LOWEST melting point?

• Hexane
  

• Ethane

• Butane

• Octane

Which has the higher boiling point: propanal or 1-propanol?

• 
• 

Answer explanation

Boiling point of 1-propanol is much higher than that of propanal due to hydrogen bonding which is present in propanol.

Which functional groups are involved in the formation of esters?

• Formyl and carbonyl

• Hydroxyl and carbonyl

• Hydroxyl and carboxyl

• Carbonyl and carboxyl

Answer explanation

Esters are organic molecules that are formed through the reaction of carboxylic acids, whose functional group is the carboxyl group ,-COOH, and alcohols, whose functional group is the hydroxyl group, -OH

The name of the functional group of an aldehyde is…

• Hydroxyl group
• Ketone group
• Amine group
• Carbonyl group