Home ยป Carbohydrates are Biomolecules MCQs Carbohydrates are December 27, 2021 2 Views Q. Carbohydrates are polyhydroxy alkynes or aldehydespolyhydroxy phenols or aldehydespolyhydroxy ketones or aldehydespolyhydroxy alkenes and aldehydes Answer: polyhydroxy ketones or aldehydes