Question

Consider conjugation. A long molecule contains a conjugated network of double bonds. Two of these double bonds begin at carbon 2 and carbon 8. At which carbon must a double bond also begin?

3

4

5

6

more than one of the above choices is correct

Answer 1

Answer: 4 and 6

Explanation: the double bonds are alternating in the chain

C—C=C—C=C—C=C—C=

1 2 3 4 5 6 7 8