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Which of the following is most reactive towards aqueous HBr:
a. 1- Phenyl-2-propanol
b. 1-Phenyl-1-propanol
c. 3-Phenyl-1-propanol
d. 2-Phenyl-1-propanol
Correct answer is option 'B'. Can you explain this answer?
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Which of the following is most reactive towards aqueous HBr:a.1-Phenyl...
Reactivity towards Aqueous HBr
To determine which compound is most reactive towards aqueous HBr, we need to consider the stability of the carbocation intermediates that are formed during the reaction. The more stable the carbocation, the more reactive the compound will be towards HBr.
Stability of Carbocation Intermediates
To determine the stability of the carbocation intermediates, we need to consider the following factors:
- Resonance: Compounds that can form resonance structures with the positive charge are more stable.
- Inductive effects: Compounds with electron-donating groups near the positive charge are more stable.
- Steric hindrance: Compounds with bulky groups near the positive charge are less stable.
Based on these factors, we can rank the stability of the carbocation intermediates in the following order:
3-Phenyl-1-propanol > 2-Phenyl-1-propanol > 1-Phenyl-1-propanol > 1-Phenyl-2-propanol
Therefore, 1-Phenyl-1-propanol is the most reactive towards aqueous HBr as it forms the least stable carbocation intermediate.
Conclusion
In conclusion, the stability of the carbocation intermediates determines the reactivity of compounds towards aqueous HBr. 1-Phenyl-1-propanol is the most reactive towards HBr as it forms the least stable carbocation intermediate.
To determine which compound is most reactive towards aqueous HBr, we need to consider the stability of the carbocation intermediates that are formed during the reaction. The more stable the carbocation, the more reactive the compound will be towards HBr.
Stability of Carbocation Intermediates
To determine the stability of the carbocation intermediates, we need to consider the following factors:
- Resonance: Compounds that can form resonance structures with the positive charge are more stable.
- Inductive effects: Compounds with electron-donating groups near the positive charge are more stable.
- Steric hindrance: Compounds with bulky groups near the positive charge are less stable.
Based on these factors, we can rank the stability of the carbocation intermediates in the following order:
3-Phenyl-1-propanol > 2-Phenyl-1-propanol > 1-Phenyl-1-propanol > 1-Phenyl-2-propanol
Therefore, 1-Phenyl-1-propanol is the most reactive towards aqueous HBr as it forms the least stable carbocation intermediate.
Conclusion
In conclusion, the stability of the carbocation intermediates determines the reactivity of compounds towards aqueous HBr. 1-Phenyl-1-propanol is the most reactive towards HBr as it forms the least stable carbocation intermediate.
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