An alkene adds hydrogen in the presence of a catalyst to give 3,4-dimethylhexane.Ozonolysis of the alkene followed by treatment with zinc and acetic acid gives a single organic product.The structure of the alkene is:

Question

Quizplus · Accepted Answer

The addition of hydrogen to an alkene suggests that the double bond is replaced with a single bond, resulting in saturation. The product formed is 3,4-dimethylhexane, which indicates that the alkene should have six carbon atoms with two methyl groups attached to the 3rd and 4th carbon atoms. This means that the double bond must have been between the 2nd and the 3rd carbon atoms. Therefore, the alkene's structure is 2-methyl-3-methylpent-2-ene. Ozonolysis of this alkene yields two moles of acetone and one mole of ethanal. Treatment with zinc and acetic acid reduces the aldehyde formed from ethanal to form ethanol. The final organic product is 2-methyl-3-methylpentane. Therefore, the correct answer is B.

An Alkene Adds Hydrogen in the Presence of a Catalyst