Which statements correctly describe the digestive system? Select four options. Food is cut into pieces in the mouth.
Food becomes dry in the mouth.
Proteins are broken down in the stomach.
Carbohydrates are first broken down in the stomach.
Food becomes mostly solid in the large intestine.
Fat is broken down into smaller droplets in the small intestine.

Compound A= 3,7-dimethyl-6-octenal

Compound B= 3-methyl-6-(prop-1-en-2-yl)-1-en-cyclohexol

Explanation:

For compound A we will have a redox reaction (PCC) in the citronellol the susceptible part to the oxidation is the alcohol group. Therefore this group would be converted into an aldehyde the molar mass of the product is 154.14 g/mol, so it fits with the mass spectrum info.

For compound B we will have an elimination reaction in which the OH remove an hydrogen from the molecule to produce a double bond near to the oxo group in the isopulegone to produce an enol. The molecule produced has a molar mass of 152.12 g/ mol so it fits with the mass spectrum info.