Explain whether or not this compound can rotate the plane polarised light:

  

In each of the following pairs of compounds, one is chiral, and the other is achiral. Identify each compound as chiral
or achiral, as appropriate.

In each of the following pairs of compounds, one is chiral, and the other is achiral. Identify each compound as chiral
or achiral, as appropriate.

In each of the following pairs of compounds one is chiral and the other is achiral. Identify each compound as chiral or achiral, as appropriate:

In each of the following pairs of compounds, one is chiral and the other is achiral. Identify each compound as chiral or achiral, as appropriate:

Draw all possible stereoisomers for the following and state which are optically active, inactive and which are
mesoforms:

Draw all possible stereoisomers for the following and state which are optically active, inactive and which are
mesoforms:

Consider the following statements:

(1) Chain and position isomerism is not possible at the same time between two isomers.
(2) Tautomerism is a chemical phenomenon which is catalysed by an acid as well as a base.
(3) Tautomers are always metamers.
(4) Tautomers are always functional isomers.
Select the correct answer using the codes given below:

Preparation of a compound $X$ leads to a mixture with $20\%$ racemization and $80\%$ retention. What should be the observed rotation of the mixture, if ${\left[\mathrm{\alpha }\right]}_{\mathrm{D}}= -12°$ ?