Question

The correct statement(s) concerning the structures $\text{E, F}$ and $\text{G}$ is/are:

• A. $\text{E, F and G are resonance structures}$
• B. $\text{(E, F) and (E, G) are tautomers}$
• C. $\text{F and G are geometrical isomers}$
• D. $\text{F and G are diastereomers}$

Answer 1

Answer: (B), (C), (D)

$\text{F and G are diastereomers}$


$\text{E, F}$ and $\text{G}$ are isomers not resonance structures.
Tautomers are isomers of a compound which differ only in the position of the protons and electrons and also easily interconvertible. The carbon skeleton of the compound is unchanged.
So, $\text{E, F}$ and $\text{E, G}$ are tautomers.
$\text{F}$ and $\text{G}$ are geometrical isomers.
It is the fact that all geometrical isomers are diastereomers.
So, $\text{F}$ and $\text{G}$ are diastereomers.