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TS EAMCET · Chemistry · General Organic Chemistry

Which of the following is a pair of functional isomers?

  1. A \(\mathrm{CH}_3 \mathrm{COCH}_3, \mathrm{CH}_3 \mathrm{CHO}\)
  2. B \(\mathrm{C}_2 \mathrm{H}_5 \mathrm{CO}_2 \mathrm{H}, \mathrm{CH}_3 \mathrm{CO}_2 \mathrm{CH}_3\)
  3. C \(\mathrm{C}_2 \mathrm{H}_5 \mathrm{CO}_2 \mathrm{H}, \mathrm{CHCO}_2 \mathrm{C}_2 \mathrm{H}_5\)
  4. D \(\mathrm{CH}_3 \mathrm{CO}_2 \mathrm{H}, \mathrm{CH}_3 \mathrm{CHO}\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(\mathrm{C}_2 \mathrm{H}_5 \mathrm{CO}_2 \mathrm{H}, \mathrm{CH}_3 \mathrm{CO}_2 \mathrm{CH}_3\)

Step-by-step Solution

Detailed explanation

Carboxylic acid and esters show functional group isomerism. When two compounds have same molecular formula but different functional groups, then functional isomerism arises. e.g., \(\mathrm{C}_2 \mathrm{H}_5 \mathrm{COOH} \text { and } \mathrm{CH}_3 \mathrm{COOCH}_3\)