Choose reaction that is not correct?
Correct answer: D. Option D: Acetic acid reacts with ammonia to form acetyl chloride and water.
- A. Option A: Acetic acid reacts with sodium to form sodium acetate and hydrogen gas.
- B. Option B: Acetic acid reacts with ethanol in the presence of sulfuric acid to form ethyl acetate and water.
- C. Option C: Acetic acid reacts with phosphorus pentoxide to form acetic anhydride.
- D. Option D: Acetic acid reacts with ammonia to form acetyl chloride and water.
Explanation
The correct answer is Option D. Acetic acid does not react with ammonia to form acetyl chloride and water; instead, it usually forms ammonium acetate. Options A, B, and C describe well-established reactions: A is the reaction with sodium forming sodium acetate, B is esterification with ethanol forming ethyl acetate, and C is dehydration with phosphorus pentoxide forming acetic anhydride.
This question appeared on the ETEA MDCAT 2016 paper, which you can sit online with every answer explained.
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About Reactivity of Carboxylic Acids
Carboxylic acids show acidic behaviour because their carboxylate ions are resonance-stabilised, and electron-withdrawing groups can change their strength. Reactions include neutralisation, esterification, formation of acid chlorides and amides, reduction, decarboxylation and substitution at the acyl carbon, which differs from the reactions of phenols.
Practise Carboxylic Acids
550 free Carboxylic Acids MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
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