Which one of the following tests used for the identification of functional groups in organic compounds does not use copper reagent?

Which class of terpenes includes $\beta$-carotene?

Which of the following is the correct order for the calorific value of nutrients?

Chemically,'digestion' is:

Which of the following statement$(s)$ is(are) true?
$(1)$ Oxidation of glucose with bromine water gives gluconic acid.
$(2)$ The two six-membered cyclic hemiacetal forms of $D-(+)-$glucose are called anomers.
$(3)$ Hydrolysis of sucrose gives dextrorotatory glucose and laevorotatory fructose.
$(4)$ Monosaccharides cannot be hydrolysed to give polyhydroxy aldehydes and ketones.

Which biological molecule in living organisms contains $Mg$ as an essential component?