PRELAB MULTIPLE CHOICE

Which test tube(s) is/are expected to show the disappearance of the reddish brown color of bromine solution the fastest?

• A and B only

• C and D only

• E and F only

• All of the test tubes will show the same color change.

The black sugar paper used in this experiment is most likely for:

• Increasing the temperature of the reaction.

• Blocking light to specific test tubes

• Neutralizing any acidic products formed

• Providing a catalyst for the reaction.

Dichloromethane, used in this experiment, serves primarily as the:

• Reactant for the reaction between bromine and the organic compounds.

• Solvent to dissolve the organic compounds

• Light source for the photochemical reaction

• Indicator for the presence of double bonds.

A control experiment for this procedure could involve replacing one of the organic compounds with

• A different alkene with a longer carbon chain.

• A known unreactive compound towards bromine under these conditions

• A mixture of cyclohexane and cyclohexene

• A stronger concentration of bromine solution

The primary observation used to determine if a reaction has occurred between bromine and the organic compound is

• Formation of a gas

• Appearance of a precipitate

• Increase in temperature of the solution

• Disappearance of the reddish brown color of bromine solution