When a ketone and its enol are in equilibrium, under most conditions the concentration of the enol is the concentration of the ketone. a) slightly higher thanb) equal toc) much higher thand) much lower thane) exactly half of

D). Much lower than  

Explanation:

When a ketone and its enol are in equilibrium, under most conditions the concentration of the enol is Much lower than the concentration of the ketone

because :

Carbon- oxygen bond is more stable(stronger) than Carbon-Carbon Bond

Keto - enol tautomerism is :

Ketone has C=O and enol has C=C

C=O bond energy is 745 kJ/mol

C=C bond energy is 614 kJ/mol

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).