Which one of the following is a sec-allylic carbocation? (a) ⊕C H2-CH=CH2 (b) CH3-CH=CH-⊕C H2 (c

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Which one of the following is a sec-allylic carbocation? (a)...

Which one of the following is a sec-allylic carbocation? (a) $\stackrel{\oplus}{\mathrm{C}} \mathrm{H}_2-\mathrm{CH}=\mathrm{CH}_2$ (b) $\mathrm{CH}_3-\mathrm{CH}=\mathrm{CH}-\stackrel{\oplus}{\mathrm{C}} \mathrm{H}_2$ (c) $\mathrm{C}_6 \mathrm{H}_5-\mathrm{CH}=\stackrel{\oplus}{\mathrm{C}} \mathrm{H}^2$ (d) $\mathrm{CH}_3-\stackrel{\oplus}{\mathrm{C}} \mathrm{H}-\mathrm{CH}=\mathrm{CH}_2$

Which one of the following is a sec-allylic carbocation?
(a) $\stackrel{\oplus}{\mathrm{C}} \mathrm{H}_2-\mathrm{CH}=\mathrm{CH}_2$
(b) $\mathrm{CH}_3-\mathrm{CH}=\mathrm{CH}-\stackrel{\oplus}{\mathrm{C}} \mathrm{H}_2$
(c) $\mathrm{C}_6 \mathrm{H}_5-\mathrm{CH}=\stackrel{\oplus}{\mathrm{C}} \mathrm{H}^2$
(d) $\mathrm{CH}_3-\stackrel{\oplus}{\mathrm{C}} \mathrm{H}-\mathrm{CH}=\mathrm{CH}_2$

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Key Concepts

Carbocations

Carbocations are positively charged carbon species that serve as key intermediates in many organic reactions. Their stability is crucial in determining reaction pathways and outcomes, influenced by factors such as the degree of substitution and surrounding electronic environments.

Allylic Carbocations

An allylic carbocation is a type of carbocation where the positive charge is adjacent to a carbon–carbon double bond. This arrangement allows for resonance stabilization as the positive charge can be delocalized over the allylic system, enhancing the carbocation's stability.

Secondary Carbocations

A secondary carbocation is one in which the positively charged carbon is attached to two other carbon atoms. When this carbocation is also in the allylic position, it is referred to as a sec-allylic carbocation, combining the stabilization effects of secondary substitution with the benefits of resonance delocalization.

Resonance Stabilization

Resonance stabilization is a key concept in understanding the stability of various carbocations, including allylic types. It involves the delocalization of the positive charge over a conjugated system, which effectively distributes and reduces the intensity of the charge, thereby increasing the stability of the intermediate.

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