нарисовать.

1.   2.2 диметилпентан

2.   2. метил бутан

3.   2.2.6 триметил 5 этилгептен-3

                CH3

                 I

1) CH3 - C - CH2 -CH2 -CH3

                 I

                CH3

2) CH3 - CH - CH2 - CH3

                    I

                 CH3

               CH3                   C2H5

                 I                          I

3) CH3 - C - CH = CH - CH - CH - CH3

                 I                                   I

              CH3                             CH3