Which one of the following groups is indicated when HCl is formed by reaction ofethanol with phosphorus pentachloride:
Correct answer: B. Hydroxyl group
- A. Amino group
- B. Hydroxyl group
- C. Halide group
- D. Hydride group
Explanation
When a -OH group(hydroxyl group) containing organic compound is reacted with with phosphorus pentachloride, it forms HCI an halogen by the reaction equation shown below:The reaction is represented as:CH3CH2OH + PCl5 → CH3CH2Cl + POCl3 + HClTherefore, the correct answer is (B) Hydroxyl group, which is the functional group present in ethanol that is replaced by a chlorine atom during the reaction.
This question appeared on the UHS MDCAT 2014 paper, which you can sit online with every answer explained.
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About Alcohols
Alcohols contain a hydroxyl group attached to a saturated carbon atom and are classified as primary, secondary or tertiary. Their nomenclature, hydrogen bonding, acidity, oxidation, dehydration, reaction with sodium and conversion to haloalkanes are covered, along with the distinction between alcohols and phenols, where the hydroxyl group is attached directly to an aromatic ring.
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