(e) For the structures below, state whether the hydrogens marked $\mathrm{H}_{\mathrm{a}}$ and $\mathrm{H}_{\mathrm{b}}$ are homotopic, enantiotopic or diastereotopic and give a reason for your answer.
(i)
(ii)

Question

Accepted Answer

∻Solution∻ ‖ 1 ⋮ **Determine the symmetry elements of the molecules**: To classify the hydrogens as homotopic, enantiotopic, or diastereotopic, we need to analyze the symmetry of the molecule and the environment around the hydrogens. ‖ ‖ 2 ⋮ **Analyze molecule (i)**: For structure (i), we have a central carbon atom bonded to a methyl group ($\mathrm{CH_3}$), an ethyl group ($\mathrm{CH_2CH_3}$), and a hydrogen atom (H). The two hydrogens $\mathrm{H_a}$ and $\mathrm{H_b}$ are attached to the central carbon. Since replacing either $\mathrm{H_a}$ or $\mathrm{H_b}$ with a deuterium atom would generate two different compounds that are not mirror images, $\mathrm{H_a}$ and $\mathrm{H_b}$ are diastereotopic. ‖ ‖ 3 ⋮ **Analyze molecule (ii)**: For structure (ii), we have a central carbon atom bonded to two methyl groups and a hydrogen atom (H). The two hydrogens $\mathrm{H_a}$ and $\mathrm{H_b}$ are attached to the central carbon. Replacing $\mathrm{H_a}$ or $\mathrm{H_b}$ with a deuterium atom would generate two compounds that are mirror images of each other, which means $\mathrm{H_a}$ and $\mathrm{H_b}$ are enantiotopic. ‖ ∻1 Answer∻ ⚹ For structure (i), the hydrogens marked $\mathrm{H_a}$ and $\mathrm{H_b}$ are diastereotopic. For structure (ii), the hydrogens marked $\mathrm{H_a}$ and $\mathrm{H_b}$ are enantiotopic. ⚹ ∻Key Concept∻ ⚹ Homotopic hydrogens are identical and interchangeable, enantiotopic hydrogens are mirror images and not superimposable, and diastereotopic hydrogens are neither identical nor mirror images. ⚹ ∻Explanation∻ ⚹ In structure (i), the hydrogens are diastereotopic because replacing them with deuterium results in different, non-mirror image compounds. In structure (ii), the hydrogens are enantiotopic because replacing them with deuterium results in mirror image compounds. ⚹◊What is the relationship between Ha and Hb in each of the chemical structures labeled (i) and (ii) provided in the image?⍭ Generate me a similar question◊

Sia