The reaction sequence is as follows:HOOC-CH_2 | vedclass

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(C) $1$. The starting material is adipic acid $(HOOC-(CH_2)_4-COOH)$. Heating a dicarboxylic acid with $BaCO_3$ leads to the formation of a cyclic ket

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Cyclopentane

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(C) $1$. The starting material is adipic acid $(HOOC-(CH_2)_4-COOH)$. Heating a dicarboxylic acid with $BaCO_3$ leads to the formation of a cyclic ketone via decarboxylation and cyclization. Thus,$A$ is cyclopentanone.$2$. The reaction of cyclopentanone $(A)$ with hydrazine $(NH_2-NH_2)$ forms the corresponding hydrazone,which is $B$ (cyclopentanone hydrazone).$3$. The reaction of the hydrazone $(B)$ with $KOH$ and heat is the Wolff-Kishner reduction,which reduces the carbonyl group to a methylene group $(-CH_2-)$. Thus,$C$ is cyclopentane.

The reaction sequence is as follows:
$HOOC-CH_2-CH_2-CH_2-CH_2-COOH$ $\xrightarrow[BaCO_3]{\Delta} A$ $\xrightarrow{NH_2-NH_2} B$ $\xrightarrow[KOH]{\text{heat}} C$
The final product $(C)$ obtained is:

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$CH_3-CO-CH_2-COOH$ $\xrightarrow{\Delta} X$ $\xrightarrow[OH^-]{HCN} Y$,$Y$ is:

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The reaction sequence is as follows:$HOOC-CH_2-CH_2-CH_2-CH_2-COOH$ $\xrightarrow[BaCO_3]{\Delta} A$ $\xrightarrow{NH_2-NH_2} B$ $\xrightarrow[KOH]{\text{heat}} C$The final product $(C)$ obtained is: