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(B) The reaction of benzene with $4$-oxopentanoyl chloride in the presence of anhydrous $AlCl_3$ (Friedel-Crafts acylation) gives compound $(P)$, whic

Vedclass · Accepted Answer

$10$

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(B) The reaction of benzene with $4$-oxopentanoyl chloride in the presence of anhydrous $AlCl_3$ (Friedel-Crafts acylation) gives compound $(P)$, which is $1$-phenylpentane-$1,4$-dione.Intramolecular aldol condensation of $(P)$ in the presence of aqueous $NaOH$ and heat gives compound $(Q)$, which is $3$-phenylcyclopent-$2$-en-$1$-one.The molecular formula of $(Q)$ is $C_{11}H_{10}O$.The molecular mass of $(Q) = (11 	imes 12) + (10 	imes 1) + (1 	imes 16) = 132 + 10 + 16 = 158 \ g/mol$.The percentage of oxygen in $(Q) = \frac{	ext{Mass of oxygen}}{	ext{Total molecular mass}} 	imes 100 = \frac{16}{158} 	imes 100 \approx 10.12 \%$.The nearest integer value is $10 \%$.

In the given reaction sequence, the percentage of oxygen in compound $(Q)$ is . . . . . . $\%$. (Nearest integer)

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