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MHT CET 202623 AprilMorning Shift
Exam
MHT CET
Year
2026
Date
23 April
Shift
Morning Shift
Subject
Chemistry
Chapter
General Organic Chemistry

MHT CET 2026 · 23 April · Morning Shift · Chemistry · General Organic Chemistry

Which of the following formula of the third higher Homologue of...

Which of the following formula of the third higher Homologue of CH3-CH2-COOH\text{CH}_3\text{-CH}_2\text{-COOH}?

Options

  1. ACH3-CH2-CH2-COOH\text{CH}_3\text{-CH}_2\text{-CH}_2\text{-COOH}
  2. BCH3-CH2-CH2-CH2-COOH\text{CH}_3\text{-CH}_2\text{-CH}_2\text{-CH}_2\text{-COOH}
  3. CCH3-CH2-CH2-CH2-CH2-COOH\text{CH}_3\text{-CH}_2\text{-CH}_2\text{-CH}_2\text{-CH}_2\text{-COOH}
  4. DCH3-CH2-CH2-CH2-CH2-CH2-COOH\text{CH}_3\text{-CH}_2\text{-CH}_2\text{-CH}_2\text{-CH}_2\text{-CH}_2\text{-COOH}

Correct answer

C. CH3-CH2-CH2-CH2-CH2-COOH\text{CH}_3\text{-CH}_2\text{-CH}_2\text{-CH}_2\text{-CH}_2\text{-COOH}

Step-by-step solution

Homologous series members differ by a successive −CH2−-\text{CH}_2- unit.

The given compound is propanoic acid: CH3-CH2-COOH\text{CH}_3\text{-CH}_2\text{-COOH}.

The first higher homologue is obtained by adding one −CH2−-\text{CH}_2- unit: CH3-CH2-CH2-COOH\text{CH}_3\text{-CH}_2\text{-CH}_2\text{-COOH}.

The second higher homologue is obtained by adding two −CH2−-\text{CH}_2- units: CH3-CH2-CH2-CH2-COOH\text{CH}_3\text{-CH}_2\text{-CH}_2\text{-CH}_2\text{-COOH}.

The third higher homologue is obtained by adding three −CH2−-\text{CH}_2- units: CH3-CH2-CH2-CH2-CH2-COOH\text{CH}_3\text{-CH}_2\text{-CH}_2\text{-CH}_2\text{-CH}_2\text{-COOH}.

Answer: CH3-CH2-CH2-CH2-CH2-COOH\text{CH}_3\text{-CH}_2\text{-CH}_2\text{-CH}_2\text{-CH}_2\text{-COOH}
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