Which of the following functional groups comprises a carbon atom bonded to a hydroxyl group? a. ester b. alcohol c. thiol d. carbonyl

The correct option is: B. alcohol                  

Explanation:

A. ester  (R-COOR'): In this functional group, the carbon atom forms a single bond with an alkoxy group and a double-bond with an oxygen atom.

B. alcohol  (R-COH): In this functional group, the carbon atom is bonded to a hydroxyl group.

C. thiol  (R-SH): In this functional group, the carbon atom is bonded to a thiol group.

D. carbonyl (R-COR'): In this functional group, the carbon atom forms a double-bond with an oxygen atom.

Therefore, alcohols are the class of organic molecules in which a carbon atom is bonded to a hydroxyl functional group.

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.