Enantiomeric Excess

Q. Which one of the following will have largest number of atoms?

1. $1\text{g Na}$
2. $1\text{g Li}$
3. $1{\text{g Cl}}_2$
4. $1\text{g Au}$

Q.

What does R and S mean in stereochemistry?

Q. 2-Butanol having an observed rotation of +9.72 has the rotation for the pure enantiomer calculated as +13.5
Then choose the correct option(s):

1. Racemic mixture is 72%
2. Racemic mixture is 28%
3. Total (-) isomer is 36%
4. Total (-) isomer is 14%

Q.

Calculate the number of atoms in $10\text{g}$ of chlorine with that of $10\text{g}$of nitrogen.

Q. Figure out the R - S nomenclature for the following compound. Type R or S as your answer.___

Q. A compound is having an observed rotation of +8.4. The rotation for the pure enantiomer is calculated as +12. The composition of mixture in terms of dextrorotatory $\left(d\right)$ and levorotatory $\left(l\right)$ is:

1. $d=70\%,l=30\%$
2. $d=30\%,l=70\%$
3. $d=15\%,l=85\%$
4. $d=85\%,l=15\%$

Q.

Total number of degree of unsaturation in compound D is:

Q.

Which of the chapter we have to start from physica, l organic and inorganic chemistry from byju's class 11 course?

Q. For a reaction, $A⟶B+C.$ it was found that at the end of 10 minutes from the start, the total optical rotation of the system was ${50}^0$ and when the reaction is complete, it was ${100}^0$. Assuming that only B and C are optically active and dextro rotatory the rate constant of this first order reaction would be

Q. Match the following with their units when required to be substituted in the formula to find specific rotation.

1. decimetre
2. degree
3. g/ml

Q. The enantiomeric excess of a racemic mixture is ___?

Q. The absolute configuration of the given compound is:

1. $R$
2. $S$
3. $E$
4. $Z$

Q. Determine CIP priorities for the following compound -

1. $-C{H}_{2}C{H}_{2}C{H}_3$> $-CH(C{H}_3{)}_2$ > H > D
2. $-CH(C{H}_3{)}_2$ > $-C{H}_{2}C{H}_{2}C{H}_3$ > - D > - H
3. D > H > $-C{H}_{2}C{H}_{2}C{H}_3$> $-CH(C{H}_3{)}_2$
4. $-C{H}_{2}C{H}_{2}C{H}_3$> $-CH(C{H}_3{)}_2$ > D > H

Q. Which of the following compounds will not show mutarotation:

1. $\beta -D(+)$glucopyranose
2. $\alpha -D(+)$ glucopyranose
3. $\alpha -D(-)$glucopyranose
4. $\beta -D(-)$glucopyranose

Q. A beaker contains two enantiomers of a compound as shown below, when a light is passed through beaker it shows the following result:


Then the correct statement is:

1. R and S is present in the same fraction
2. Compound shows optical activity because of enantiomeric excess
3. Compound shows optical inactivity because of enantiomeric excess
4. Compound shows optical inactivity because of external compensation

Q. Determine CIP priorities for the following compound -

1. $-C{H}_{2}C{H}_{2}C{H}_3$> $-CH(C{H}_3{)}_2$ > H > D
2. $-CH(C{H}_3{)}_2$ > $-C{H}_{2}C{H}_{2}C{H}_3$ > - D > - H
3. $-C{H}_{2}C{H}_{2}C{H}_3$> $-CH(C{H}_3{)}_2$ > D > H
4. D > H > $-C{H}_{2}C{H}_{2}C{H}_3$> $-CH(C{H}_3{)}_2$

Q. State whether the following statement is True or False
The specific rotation of a compound is measured by an apparatus called polarimeter.

1. True
2. False

Q. We got promising results by using radioactive isotopes for the treatment of:

1. diabetes
2. heart disease
3. cancer
4. pneumonia

Q. Figure out the R - S nomenclature for the following compound. Type R or S as your answer.___

Q. The enantiomeric excess of a sample is a measure of its optical purity -True or False?

1. False
2. True