1) D-xylose, L-arabinose and D-arabinose are naturally occurring five-carbon sugars, known as pentoses, found in living plant cells. They are critical molecules used as building blocks in the production of hemicelluloses. Assume only linear structures (not cyclic or ring structures) for this problem. (16 points) a) Draw the chemical structures of these three pentose sugars and determine the molecular weight ofeach to + 0.01 grams/mole. (3 points) b) Write the combustion reaction for each of these three pentoses. (5 points) c) Using the bond energy values you received in class, determine the energy released in kJ/mole from the combustion reaction you have written above. (5 points) d) The literature states that the energy released from the combustion of these pentose sugars typically ranges from -2338.8 kJ/mole to -2349.5 kJ/mole. How does your computed value compare to the range of values seen in the literature? Provide a possible explanation for any discrepancies. (3 points)