Stereochemical Aspects of Nucleophilic Substitution Reactions of Haloalkanes and Haloarenes

Chiral molecules are :

The enantiomeric excess and observed rotation of a mixture containing $6 \mathrm{gm}$ of  $(+)-2 -\mathrm{butanol}$ and $4\mathrm{gm}$ of $\mathbf{(}\mathbf{-}\mathbf{)}\mathbf{-}\mathbf{2}$ -butanol are respectively (If the specific rotation of enantiomerically pure $(+)-2-$ butanol is $+13.5$ unit).

Which of the following pairs of compounds are enantiomers:

How many chiral centres are present in the following compounds?

The number of chiral carbon atoms in the compound $\mathrm{W}, \mathrm{X} , \mathrm{Y}$ and $\mathrm{Z}$ respectively would be

Indicate whether each of the following compound is '$\text{E}$' or '$\text{Z}$'.

Which configuration will be adopted by the product at carbon atoms marked ($1$) and ($2$), respectively, in the given reaction?

Cyclohexene reacts with limited amount of bromine in the presence of light to form product $\mathrm{X}\left({\mathrm{C}}_6{\mathrm{H}}_9\mathrm{Br}\right).$ The correct statement about $\mathrm{X}$ is 

The total number of optically active compounds formed in the following reaction is

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

Racemic mixture is formed by mixing two