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9. Hydricarbon — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry9. Hydricarbon1 Mark
MCQ
In the following reaction

The $\%$ yield for reaction $I$ is $60 \%$ and that of reaction II is $50 \%$. The overall yield of the complete reaction is $..........\%$ [nearest integer]

  • A
    $31$
  • B
    $32$
  • C
    $33$
  • ✓
    $30$
✓

Answer

Correct option: D.
$30$
d
Moles of benzene sulphonic acid before reaction $II =0.6\,n$

Moles obtained for phenol (with $\%$ yield $=50 \%$ ) = $0.6 \times 0.5\,n=0.3\,n$

So over all $\%$ yield of complete reaction $=\frac{0.3\,n }{ n } \times 100=30$

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