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(D) $1$. The starting material is $n$-butyl bromide $(CH_3CH_2CH_2CH_2Br)$.$2$. Reaction with $Na$ in dry ether is the Wurtz reaction,which couples th

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$9$

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(D) $1$. The starting material is $n$-butyl bromide $(CH_3CH_2CH_2CH_2Br)$.$2$. Reaction with $Na$ in dry ether is the Wurtz reaction,which couples the alkyl group to form $n$-octane $(CH_3(CH_2)_6CH_3)$,so $X$ is $n$-octane.$3$. Aromatization of $n$-octane using $	ext{Cr}_2	ext{O}_3$ at $773 	ext{ K}$ and $10-20 	ext{ atm}$ leads to the formation of ethylbenzene $(Y)$.$4$. Friedel-Crafts acylation of ethylbenzene with $	ext{CH}_3	ext{COCl}$ in the presence of anhydrous $	ext{AlCl}_3$ gives $p$-methylacetophenone (or $o$-methylacetophenone,but $p$- is major) as $Z$. The structure of $p$-methylacetophenone is $CH_3-C_6H_4-COCH_3$.$5$. In $p$-methylacetophenone $(CH_3-C_6H_4-COCH_3)$:- $sp^3$ carbons: The methyl group on the ring $(1)$,the methyl group on the carbonyl $(1)$. Total $a = 2$.- $sp^2$ carbons: The $6$ carbons of the benzene ring $(6)$ and the carbonyl carbon $(1)$. Total $b = 7$.$6$. The value of $(a+b) = 2 + 7 = 9$.

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