Question

The specific rotation of a pure enantiomer is + 16o. Its observed rotation if it is isolated from a reaction with 25% recemisation and 75% retention is

Solution

Correct option is

+12o

% Enantiomeric excess  

            

Observed specific rotation   

             

            = + 12o.

SIMILAR QUESTIONS

Q1

The molecular formula of a saturated compound is C2H4Cl2. The formula permits the existence of two

Q2

Keto form is more stable in

Q3

Enol form is more stable in

Q4

Which will form geometrical isomers?

Q5

(+) and (–) forms of optically active compounds are different in

Q6

Number of chiral centres in

Q7

Which of the following statements is not correct?

Q8

The functional groups —OH, —COOH, —CHO, —OCH3 attached to a chiral carbon is in the preference order

Q9

Which of the following statements is/are incorrect for D-(+)-glyceraldehyde?

Q10

An enantiomerically pure acid is treated with racemic mixture of an alcohol having one chiral carbon. The ester formed will be