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Chapter 15: Q6. (page 570)

Question: Using Mechanism 15.1 as a guide, write the mechanism for the reaction of CH4with Br2 to form CH3 Br and HBr. Classify each step as initiation, propagation, or termination.

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01

Radical halogenation of alkanes

The first step is initiation that involves the hemolysis cleavage ofform two radicals.


The second step is propagation that involves the attack of the radical to the alkane to form alkyl and radical.


The third step is termination that involves the reaction of radicals together to stop the chain.

02

 Step 2: Explanation

The steps involved in the reaction are shown below:

Initiation:

Initiation reaction

Propagation:

Propagation reaction

Termination:

Termination reaction

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Most popular questions from this chapter

Question: When two monomers (X and Y) are polymerized together, a copolymer results. An alternating copolymer is formed when the two monomers X and Y alternate regularly in the polymer chain. Draw the structure of the alternating copolymer formed when the two monomers, CH2CCl2 and CH2,=CHC6H5 are polymerized together.

Consider the following Bromination:

(a) Calculate ΔH° for this reaction by using the bond dissociation energies in Table 6.2.

(b) Draw out a stepwise mechanism for the reaction, including the initiation, propagation, and termination steps.

(c) Calculate ΔH° for each propagation step.

(d) Draw an energy diagram for the propagation steps.

(e) Draw the structure of the transition state of each propagation step

Question: Calculate ∆H0 for the rate-determining step of the reaction of CH4 with I2. Explain why this result illustrates that this reaction is extremely slow.

Devise a synthesis of 1-methylcyclohexene oxide from methylcyclohexane. You may use any other required organic or inorganic reagents

Question: Draw the major product formed when each cycloalkane is heated with Br2.

a.

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