Enantiomeric Excess

Q. what is rule of nomenclature of compound having two functional group

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

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

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

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