Import Question JSON

$\text{Hint: Compounds having the same molecular formula but with different structures are called structural isomers.}$ $\text{Step 1: Analysis of structural isomers}$ $\text{The given compounds have the same molecular formula but they differ in the position of the functional group (ketone group). In structure I, the ketone group is at the C-3 of the parent chain (hexane chain) and in structure II, the ketone group is at the C-2 of the parent chain (hexane chain). Hence, the given pair represents structural isomers.}$ $\text{Step 2: Definition of geometrical isomers}$ $\text{Compounds having the same molecular formula, the same constitution, and the sequence of covalent bonds, but with the different relative positions of their atoms in space are called geometrical isomers.}$ $\text{In structures I and II, the relative position of Deuterium (D) and hydrogen (H) in space are different. Hence, the given pairs represent geometrical isomers.}$ $\text{Analysis of option (c): The given structures are canonical structures or contributing structures. They are hypothetical and individually do not represent any real molecule. Hence, the given pair represents resonance structures, called resonance isomers.}$ $\text{Analysis of option (d): The alkyl halide did not show geometrical isomerism.}$ $\text{Geometrical isomerism requires restricted rotation around a bond (typically a double bond) and different substituents on each carbon of the double bond. Only option 2 shows this with deuterium and hydrogen substituents around a C=C double bond.}$