Which one of the following will give an ionic product?
Correct answer: B. CH3CH2OH + Na →
- A. CH3CH2OH + PCl5 →
- B. CH3CH2OH + Na →
- C. CH3CH2OH + PCl3 →
- D. CH3CH2OH + 5OCl →
Explanation
The correct answer is Option B: CH3CH2OH + Na →. In this reaction, sodium (Na), a metal, reacts with ethanol (CH3CH2OH) to form sodium ethoxide (CH3CH2ONa) and hydrogen gas (H2). Sodium ethoxide is an ionic compound, as it consists of the sodium ion (Na+) and the ethoxide ion (CH3CH2O-). This ionic nature is due to the transfer of an electron from sodium to the ethoxide group. The other options involve covalent reactions that do not result in ionic products: Option A involves the formation of alkyl chlorides, Option C involves the substitution of hydroxyl groups by chlorine without forming ionic compounds, and Option D suggests a non-standard reaction.
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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