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The radical, −CH2 is aromatic because it has:

1. 7 p-orbitals and 6 unpaired electrons
2. 7 p-orbitals and 7 unpaired electrons
3. 6 p-orbitals and 7 unpaired electrons
4. 6 p-orbitals and 6 unpaired electrons

Correct answer: 7 p-orbitals and 7 unpaired electrons

Solution

The −CH2 radical is aromatic because it has 7 p-orbitals (one from each carbon in the conjugated system) and 7 unpaired electrons, satisfying the Huckel rule (4n+2 π-electrons).

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