Y12 Free Radical Substitution

A free radical has

• unpaired electrons

• paired electrons

• no electrons

• even number of electrons

Single headed arrow show....

• attack or movement of an unpaired electron

• attack or movement of an electron pair

• attack or movemant of a lone pair

• attack or movemant of an electron pair and unpaired electron

Which of the following is a free radical substitution reaction?

• Hydrolysis of alkanes

• Halogenation of alkanes

• Hydrogenation of alkanes

• Combustion of alkanes

How many steps of mechanism for Free Radical Substitution Reaction of Alkane.

• 1

• 2

• 3

• 4

State the function of UV light for the above reaction.

• To provide energy for heterolytic cleavage to occur in bromine molecule.

• To provide energy for homolytic cleavage to occur in bromine molecule.

• To provide energy for heterolytic cleavage to occur in propane molecule.

Which step produces two highly reactive chlorine free radicals.

• Propagation Step

• Termination Step

• Initiation Step

• Elimination Step

What is the name of step for the mechanism above.

• Elimination Step

• Initiation step

• Termination step

• Propagation step

Which of the step is the propagation step?

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• 
• 
• 

Which equation represents a termination step?

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• 

What is a free radical?

• An atom or molecule with an unpaired electron

• An atom or molecule with a paired electron

• A molecule with a double bond

• A stable molecule with no electrons