2) A monoterpene A has the molecular formula C10H20O and can exist as a pair of optical isomers. Compound A has three asymmetric centers and is easily oxidized to compound B with the molecular formula C10H18O. i. If compound A is assigned ( 1S,2R,4R) configuration, deduce the structures of compounds A and B ii. Give the product of the reaction between compound A and PBr3 iii. State two biological properties and uses of compound A 3) All sesquiterpenes are formed from farnesyl pyrophosphate (FPP) and as a result, a large variety of different cyclic sesquiterpenes have been discovered in nature. Vetispiradiene is a known sesquiterpene isolated from Hyoscyamus maticus plant. Using reaction schemes, suggest a mechanism for FPP transformation to Vetispiradiene. FPP Vetispiradiene