Conjugation Part 1 - Which of the following is the most...

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Which of the following is the most stable radical?
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Rank the following alkyl radicals in order of increasing stability (least < < <most). 1<3<2<4
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What is the product of the following reaction?
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Predict the product of the following reaction. 1-methylcyclohexene + HBr/H 2 O 2 ? Br
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Identify the reagent(s) that will promote the following transformation. A) HBr, tetrahydrofuran B) HBr, peroxides C) Br 2 , CCl 4 D) Br 2 , H 2 O
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Conjugation occurs whenever p orbitals can overlap on three or more adjacent atoms. The four p orbitals on adjacent atoms make a 1,3-diene a conjugated system.
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Having three or more p orbitals on adjacent atoms allows p orbitals to overlap and electrons to delocalize . 1,4-Pentadiene is an isolated diene . The π bonds in 1,4-pentadiene are too far apart to be conjugated.
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Which of these compounds have delocalized electron density?
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The allyl carbocation is another example of a conjugated system . Conjugation stabilizes the allyl carbocation.
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Drawing resonance structures for the allyl carbocation is a way to see how to use Lewis structures to illustrate how conjugation delocalizes electrons. The true allyl cation is a hybrid of the two resonance forms. In the hybrid, the positive charge is delocalized over the two terminal carbons. Delocalizing electron density lowers the energy of the hybrid, thus stabilizing the allyl carbocation and making it more stable than a normal 1 ° carbocation.
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+ + What are the resonance structures of these compounds?
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