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8.2 Carboxylic acids and their derivative — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistry8.2 Carboxylic acids and their derivative1 Mark
MCQ
Which one of the following reactions will not yield propionic acid?
  • A
    $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{COCH}_{3}+\mathrm{OI}^{-} / \mathrm{H}_{3} \mathrm{O}^{+}$
  • B
    $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{3}+\mathrm{KMnO}_{4}(\mathrm{Heat}), \mathrm{OH} / \mathrm{H}_{3} \mathrm{O}^{+}$
  • C
    $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CCl}_{3}+\mathrm{OH}^{-} / \mathrm{H}_{3} \mathrm{O}^{+}$
  • ✓
    $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{Br}+\mathrm{Mg}, \mathrm{CO}_{2}$ dry ether $/ \mathrm{H}_{3} \mathrm{O}^{+}$
✓

Answer

Correct option: D.
$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{Br}+\mathrm{Mg}, \mathrm{CO}_{2}$ dry ether $/ \mathrm{H}_{3} \mathrm{O}^{+}$
d
All gives propanoic acid as product but option $4$ gives butanoic as product

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