7.3.2      Alkanes

Section A

 

For each of the questions only one of the lettered responses (A-D) is correct.

 

Select the correct response in each case and mark its code letter by connecting the dots as illustrated on the answer sheet.

 

1.    One of the terminal steps in the photochemical chlorination of methane is:

 

A  Cl2                                2Cl•

B  CH3•  + CH3•                           CH3 CH3

C CH4  +  Cl-                                CH3Cl  +  H+

D  CH4  +  Cl•                              CH3  +  HCl

 

2.    Which one of the following represents a propagation step in the chlorination of methane?

 

A     CH4  +  Cl2                            CH3Cl  +  HCI

       B     CH4  +  Cl•                            CH3•  +  HCI

C     Cl2                                          2Cl•

       D     CH3• + Cl•                            CH3Cl

 

1.   10 cm3 of an equimolar mixture of hydrogen and methane were combusted by exploding with 25 cm3 of pure oxygen.  All volume measurements were made at 20oC and 1 atmosphere pressure.

 

The volume of the mixture (in cm3 ) after the explosion was:

          A 12.5

B 15

C 17.5

D 20