Question:
Consider the following reaction of benzene. the percentage of oxygen is _______ %. (Nearest integer)
Consider the following reaction of benzene. the percentage of oxygen is _______ %. (Nearest integer)
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In calculation-based organic problems, estimate percentages for simple final products ($R-OH, R-COOH$) to check for viability.
Updated On: Mar 14, 2026
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Correct Answer: 17
Solution and Explanation
Benzene undergoes Friedel–Crafts acylation followed by alkaline hydrolysis,
leading to the formation of an aromatic carboxylic acid.
The final product $(Q)$ is phenylacetic acid.
\[
Q = \mathrm{C_6H_5CH_2COOH}
\]
Molecular formula of $Q$:
\[
\mathrm{C_8H_8O_2}
\]
Molar mass of $Q$:
\[
= (8 \times 12) + (8 \times 1) + (2 \times 16)
= 96 + 8 + 32 = 136
\]
Mass of oxygen present:
\[
= 2 \times 16 = 32
\]
Percentage of oxygen:
\[
\%\,\text{Oxygen} = \frac{32}{136} \times 100
= 23.52\%
\]
Nearest integer:
\[
\boxed{23\%}
\]
\[
\therefore \text{Percentage of oxygen in the product is } 23\%.
\]
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