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(A) Glucose on prolonged heating with $HI$ gives $n$-hexane $(CH_3CH_2CH_2CH_2CH_2CH_3)$,which is compound '$C$'.In the Wurtz reaction,two alkyl halid

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$CH_3CH_2CH_2Cl$

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(A) Glucose on prolonged heating with $HI$ gives $n$-hexane $(CH_3CH_2CH_2CH_2CH_2CH_3)$,which is compound '$C$'.In the Wurtz reaction,two alkyl halide molecules react with sodium metal to form an alkane.To obtain $n$-hexane $(C_6H_{14})$ via Wurtz reaction,the alkyl halide '$D$' must be $n$-propyl chloride $(CH_3CH_2CH_2Cl)$.The reaction is: $2CH_3CH_2CH_2Cl + 2Na \rightarrow CH_3CH_2CH_2CH_2CH_2CH_3 + 2NaCl$.

On prolonged heating with $HI$,glucose gives a compound '$C$',which can be obtained by Wurtz reaction using sodium metal and compound '$D$'. Identify '$D$'.

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