Which of these chemicals contains a carbon–carbon double bond?
c2h6
c2h4
c2h2

I think the correct answer from the choices listed above is the second option. The chemical that contains a  carbon–carbon double bond would be C2H4. This belongs to the group of alkenes which has a general formula of CnH2n. Hope this answers the question.

1. C

2. C

Explanation:

were made of many many cells, fertilized egg is our first cell