Caryophyllene, a compound found in oil of cloves, has the molecular formula C15H24 and has no triple

Question:

Caryophyllene, a compound found in oil of cloves, has the molecular formula C15H24 and has no triple bonds. Reaction of caryophyllene with an excess of hydrogen in the presence of a platinum catalyst produces a compound with the formula C15H28. How many
(a) Double bonds and
(b) Rings does a molecule of caryophyllene have?