Which will be more stable carbocation upon heterolysis of #"C"-"Cl"# bond?
Consider the consequence of the heterolysis you describe for each, in turn,
This would be stabilized by resonance,
The cyclic ether would be acting as an electron donating group, stabilizing the positive charge.
This is stabilized by hyperconjugation to the highest degree (
This is a primary carbocation: a very unstable molecule.
As a result of this qualitative analysis,
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The carbocation formed upon heterolysis of a C-Cl bond will be more stable if the carbon atom bearing the positive charge is more substituted. This means that a tertiary carbocation (where the carbon atom bearing the positive charge is attached to three other carbon atoms) will be more stable than a secondary carbocation, which in turn will be more stable than a primary carbocation. The stability of carbocations follows the order: tertiary > secondary > primary > methyl.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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