Organic Chemistry 1 · Radical reactions and selectivity
Separate a dot from a pair
Conditions: A drawing claims to show neutral Br₂ becoming two neutral Br• atoms but uses one full-headed arrow from Br–Br to a single Br.
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Drag from the electrons that move to where they go, or tap one and then the other. Every arrow is checked; Hint helps when you're stuck. No account needed.
The question
What correction is needed?
Reveal the answer and explanation
Answer and explanation
Correct answer Replace it with two fishhooks, one from the bond to each Br
Each neutral radical must receive one electron from the original bond pair.
Not this one Keep the full-headed arrow and merely add a radical dot to each atom
That creates a mismatch between the electron movement and the displayed electron counts.
Not this one Use a full-headed arrow from each Br atom toward the bond
That depicts electron donation toward bond formation rather than splitting the existing bond.
Worked solution
A full-headed arrow transfers a pair to one atom and corresponds to heterolysis. Neutral homolysis divides the pair and requires two separate single-electron destinations.
What you'll practice
Diagnose using a two-electron arrow for homolysis.
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