Predict A and B in the following reaction seq | vedclass

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(D) The reaction sequence is as follows:$1$. The first step is the Hell-Volhard-Zelinsky $(HVZ)$ reaction,where pentanoic acid $(CH_3-CH_2-CH_2-CH_2-C

Vedclass · Accepted Answer

$A = CH_3-CH_2-CH_2-CH(Br)-COOH$,$B = CH_3-CH_2-CH=CH-COO^-K^+$

Vedclass · Answer

(D) The reaction sequence is as follows:$1$. The first step is the Hell-Volhard-Zelinsky $(HVZ)$ reaction,where pentanoic acid $(CH_3-CH_2-CH_2-CH_2-COOH)$ reacts with $Br_2$ in the presence of red phosphorus to undergo $\alpha$-halogenation,forming $2$-bromopentanoic acid as product $A$ $(CH_3-CH_2-CH_2-CH(Br)-COOH)$.$2$. The second step involves treatment with alcoholic $KOH$,which acts as a strong base and promotes $\beta$-elimination of $HBr$ from the $\alpha$-bromo acid. This results in the formation of an $\alpha,\beta$-unsaturated carboxylate salt,specifically potassium pent$-2-$enoate $(CH_3-CH_2-CH=CH-COO^-K^+)$ as product $B$.

Predict $A$ and $B$ in the following reaction sequence:

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