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

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

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.

Similar Questions

The incorrect match is:

How will you prepare the following compounds from benzene? You may use any inorganic reagent and any organic reagent having not more than one carbon atom:
$(i)$ Methyl benzoate
$(ii)$ $m$-Nitrobenzoic acid
$(iii)$ $p$-Nitrobenzoic acid
$(iv)$ Phenylacetic acid
$(v)$ $p$-Nitrobenzaldehyde.

The major product in the following reaction is

The total number of carboxylic acid groups in the product $P$ is

An ester $(A)$ with molecular formula $C_9H_{10}O_2$ is reacted with an excess of $CH_3MgBr$. The resulting product is treated with concentrated $H_2SO_4$ to form an olefin $(B)$. Ozonolysis of $(B)$ yields a ketone with the formula $C_8H_8O$. What is the structure of $(A)$?

Vedclass Test Series

Exam Paper Generator

Online Exam Module