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Physical Properties of Aromatic Compounds

the specific ...

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the specific rotation of pure enantiomer is +16, its observed rotation if it is isolated from a reaction with 25% racemisation and 75% retention, is?

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Q. The enantiomeric excess of a mixture of 2-bromobutane with an observed specific rotation of

+ {18.5}^{\circ}

. The specific rotation of (R)-2-bromobutane is

- {23.1}^{\circ}

and (S)-2-bromobutane is

+ {23.1}^{\circ}

.
How many percent of each enantiomer is present in the mixture?

Q. The specific rotation of a pure substance is

{1.68}^{\circ},

What is the specific rotation of a mixture containing 75

%

of this isomer and 25

%

(-)

Q. Calculate the enantiomeric excess of a mixture of 2-bomobutane with an observed specific rotation of

+ {18.5}^{\circ}

. The specific rotation of (R)-2-bomobutane is

- {23.1}^{\circ}

and (S)-2-bomobutane is

+ {23.1}^{\circ}

Q. A compound is having an observed rotation of +10.5. The rotation for the pure enantiomer is calculated as +14.
The % optical purity of the compound is:

(+) -

Mandelic acid has a specific rotation of

+ 158^{o}

. What would be the observed specific rotation of a mixture of

25 %

(-) -

mandelic acid and

75 % (+) -

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