ROH + HX → R-X + H2ODecreasing order of reactivity is:
Correct answer: C. HI > HBr > HCl
- A. HCl > HBr > HI
- B. HI > HCl > HBr
- C. HI > HBr > HCl
- D. HBr > HCl > HI
Explanation
R - OH → R-X + H2ONucleophilicity: I > Br > Cl > F This depends upon bond length. As chlorine is more electronegative than iodine so its bond length is less and stronger as compare to iodine. Similarly chlorine due to stronger bond it will also react slowly and is considered less reactive .
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Alcohols are classified as primary, secondary or tertiary and studied through their hydrogen bonding, acidity, oxidation and reactions with active metals, acids and halogenating agents. Phenols require separate treatment because the hydroxyl group is attached to an aromatic ring, making their acidity and electrophilic substitution different from ordinary alcohols.
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