Choose the correct option(s) for the followin | vedclass

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Question

(A) $1$. The starting material is $4$-methoxyphenylbut-$3$-ynal. Treatment with $Hg^{2+}, dil. H_2SO_4$ hydrates the alkyne to a ketone,yielding $4$-m

Vedclass · Accepted Answer

$2,4$

Vedclass · Answer

(A) $1$. The starting material is $4$-methoxyphenylbut-$3$-ynal. Treatment with $Hg^{2+}, dil. H_2SO_4$ hydrates the alkyne to a ketone,yielding $4$-methoxyphenyl-$4$-oxobutanal.$2$. Oxidation with $AgNO_3, NH_4OH$ (Tollens' reagent) converts the aldehyde to a carboxylic acid,followed by Clemmensen reduction $(Zn-Hg, conc. HCl)$ which reduces the ketone to a methylene group,resulting in $4-(4-methoxyphenyl)butanoic$ acid $(Q)$.$3$. Treatment of $Q$ with $SOCl_2$ followed by $AlCl_3$ (Friedel-Crafts acylation) leads to intramolecular cyclization to form $7-methoxy-1-tetralone$ $(R)$.$4$. Finally,Clemmensen reduction $(Zn-Hg, conc. HCl)$ of the ketone $R$ gives $6-methoxytetralin$ $(S)$.$5$. Comparing with the given structures,$Q$ matches structure $(2)$,$R$ matches structure $(4)$,and $S$ matches structure $(4)$. Thus,the correct options are $2$ and $4$.

Choose the correct option$(s)$ for the following reaction sequence. Consider $Q$,$R$ and $S$ as major products.

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