Question

1) Draw the skeletal structures of the 3 products formed from CH4 and Cl in free radical reactions.

1a) Draw the skeletal structure of the major monohalogenated organic product when cyclohexane reacts with Br in the presence of light and heat.

1b)Draw the skeletal structure of the major monohalogenated organic product when 2,2,4-trimethylhexane is treated with Br in the presence of light and heat.

Answer 1

In this reaction Cl2 is bond is broken by using heat or radiation. When it is broken highly reactive Cl radical is formed. Lets show it.

This radical species due to its reactivity, react with CH4 and forms a carbon radical:

Product 1)

this process is also called as an initiation.

When this carbon radical reacts with another CH4 molecule, initiates another CH3. radical

Product 2 )

when two carbon radial react:

Prdoct third :

This process is called termination:

Question 1 a )

Reaction of cyclohexane + Br2

light breaks Br-Br bond and forms Br radical. which generates reacts with cyclohexane and forms Bromocyclohexane

1 (b)

When Br2 reacts with 2,2,4-trimethylcyclohexane: More substited carbon radical is more stable and major product is also formed accordingly.