Cat urine. May sound weird, may get it wrong, but it's true. Your teacher'll freak out.
The service rating of passengers car and commercial automotive motor oils
Answer: Thomson
Explanation: It verified J. J. Thomson's work on the atomic structure.
This is not chemistry but it's A, off top.
Answer:
Alkanes, alkenes and alkynes are simple hydrocarbon chains with no functional groups. Alkanes are identified because the carbon chain has only single bonds. Alkenes have at least one double bond and alkynes have at least one triple bond. The most common alkyne is ethyne, better known as acetylene.