What is Resonance in Haloarenes and How Can I Solve This Problem?

Thread starter Nitin_Naudiya
Start date May 18, 2012
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Resonance

In summary, resonance in haloarenes is the delocalization of electrons in the carbon-halogen bond, resulting in a more stable molecule. This affects the reactivity of haloarenes, making them less reactive compared to alkanes. Resonance can occur in different positions on a haloarene, allowing for multiple resonance structures. It can also decrease the acidity of haloarenes by stabilizing the conjugate base. Furthermore, resonance can explain the physical properties of haloarenes, such as their boiling and melting points.

May 18, 2012

Nitin_Naudiya

Please Help me with this Problem.

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May 21, 2012

Borek

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Please post the question in the body of the message, not as a picture. Structural formulas are OK, but most people visiting the thread don't see the question.

1. What is resonance in haloarenes?

Resonance in haloarenes refers to the phenomenon where the electrons in the carbon-halogen bond are delocalized, resulting in a more stable molecule. This is due to multiple resonance structures that can be drawn for haloarenes, where the double bond character is shared between the carbon and halogen atoms.

2. How does resonance affect the reactivity of haloarenes?

Resonance increases the stability of haloarenes, making them less reactive compared to their corresponding alkanes. This is because the delocalized electrons in resonance structures are less available for chemical reactions.

3. Can resonance occur in different positions on a haloarene?

Yes, resonance can occur in different positions on a haloarene. The most common positions are ortho (adjacent to the halogen atom), meta (two carbon atoms away from the halogen atom), and para (opposite side of the halogen atom). This allows for multiple resonance structures to be drawn for a single haloarene molecule.

4. How does resonance affect the acidity of haloarenes?

Resonance can decrease the acidity of haloarenes by stabilizing the conjugate base. This is because the delocalized electrons in the resonance structures can spread the negative charge over a larger area, making the molecule less acidic.

5. Can resonance be used to explain the physical properties of haloarenes?

Yes, resonance can be used to explain the physical properties of haloarenes such as their boiling points and melting points. The greater stability due to resonance makes them less volatile and more solid at room temperature compared to their corresponding alkanes.