Final answer:
Compound X is 3,4-dimethyl-3-hexene, a symmetrical alkene that forms 2,5-dimethylhexane upon hydrogenation and yields a single aldehyde when reacted with ozone followed by zinc in aqueous acid.
Step-by-step explanation:
The compound X has the formula C8H16 and reacts with one molar equivalent of hydrogen to form 2,5-dimethylhexane, which indicates that X is an alkene and that the double bond is located between the carbons 2 and 3 (as the dimethyl groups are on carbons 2 and 5 of the hexane product). The reaction with ozone followed by zinc in aqueous acid yielding a single aldehyde suggests that X is a symmetrical alkene, as only one type of aldehyde is formed. Therefore, Compound X is most likely to be 3,4-dimethyl-3-hexene, a symmetrical alkene reacting through a hydrogenation reaction.