Lucas Test is used to detect the presence of:
Correct answer: A. Alcohols
- A. Alcohols
- B. Phenols
- C. Amino acids
- D. Carboxylic acids
Explanation
The Lucas test is a chemical test used to differentiate between primary, secondary, and tertiary alcohols. It involves the use of Lucas reagent (a mixture of concentrated hydrochloric acid and zinc chloride). Tertiary alcohols react immediately, secondary alcohols react within a few minutes, and primary alcohols do not react at room temperature. Therefore, the correct answer is alcohols. Phenols, amino acids, and carboxylic acids are not detected using the Lucas test; they require different tests for identification.
This question appeared on the ETEA MDCAT 2012 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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535 free Alcohols and Phenols MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
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