Which statement is true? Compounds with R stereocenters rotate plane-polarized l

Question

Which statement is true? Compounds with R stereocenters rotate plane-polarized light clockwise. For equal concentrations and equal path lengths, solutions of (+) and (-) enantiomers rotate plane-polarized lights equally, but in opposite directions. Racemic mixtures can rotate plane-polarized light either clockwise or counterclockwise. Meso compounds can rotate plane-polarized light either clockwise or counterclockwise. Fatty acids contain one carboxyl ground plus an odd number of carbons in the chain. T or F Which statement is true? Compounds with R stereocenters rotate plane-polarized light clockwise. For equal concentrations and equal path lengths, solutions of (+) and (-) enantiomers rotate plane-polarized lights equally, but in opposite directions. Racemic mixtures can rotate plane-polarized light either clockwise or counterclockwise. Meso compounds can rotate plane-polarized light either clockwise or counterclockwise. Fatty acids contain one carboxyl ground plus an odd number of carbons in the chain. T or F Phospholipids are found in the bilayer that composes the cells membranes. T or F motes of cyclohexene are oxidized to adipic acid using H_2O_2. 14.6 grams of adipic acid was collected. All of this was added to a reaction vessel with excess ethanol and H_2SO_4 to produce diethyladipate (C_10 H_18 O_4). 16.2 grams of the ester was recovered. What is the percent yield overall? Phospholipids are found in the bilayer that composes the cells membranes. T or F motes of cyclohexene are oxidized to adipic acid using H_2O_2. 14.6 grams of adipic acid was collected. All of this was added to a reaction vessel with excess ethanol and H_2SO_4 to produce diethyladipate (C_10 H_18 O_4). 16.2 grams of the ester was recovered. What is the percent yield overall?

Explanation / Answer

Answers for 18:

a) Compounds with R stereocenter rotate the plane-polarized light clockwise.........True

b) For equal concentrations and equal path lengths, solutions of (+) and (-) enantiomers rotate plane-polarized light equally, but in opposite directions..........True.

c) Racemic mixtures can rotate plane-polarized light either clockwise or counterclockwise.......False.

d) Meso compounds can rotate plane-polarized light either clockwise or counterclockwise.......False.

Answer for 19: Fatty acids contain one carboxyl group plus an odd number of carbons in the chain....False

Answer for 20: Phospholipids are found in the bilayer that composes the cell membrane............True.

Answer for 21:

Amount of cyclohexene oxidized: 0.12 moles

Amount of adipic acid collected = 14.6 g

Number of moles of adipic acid collected: mass of adipic acid collected / molar mass = 14.6 g / 146.14 g/mol = 0.099 moles

Amount of diethyl adipate produced during esterification: 16.2 g

Number of moles of diethyl adipate produced: mass of adipate produced / molar mass: 16.2/202.25 = 0.080 moles

Theoritically, 0.12 moles of cyclohexene should produce 0.12 moles of diethyl adipate

If 0.12 moles of diethyl adipate produced is 100%

Then 0.080 moles of diethyl adipate produced will be equal to 0.08 x 100/0.12 = 66.66%

Hence the overall yield of diethyl adipate from cyclohexene is 66.66%

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