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(C) The reaction sequence is as follows: $1.$ Formation of Grignard reagent: $(CH_3O)_2CH-CH_2-CH_2-CH_2-Br + Mg \rightarrow (CH_3O)_2CH-CH_2-CH_2-CH_

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$H-CO-CH_2-CH_2-CH_2-CH_2OH$

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(C) The reaction sequence is as follows: $1.$ Formation of Grignard reagent: $(CH_3O)_2CH-CH_2-CH_2-CH_2-Br + Mg \rightarrow (CH_3O)_2CH-CH_2-CH_2-CH_2-MgBr$ $2.$ Nucleophilic addition to formaldehyde: $(CH_3O)_2CH-CH_2-CH_2-CH_2-MgBr + H_2C=O \rightarrow (CH_3O)_2CH-CH_2-CH_2-CH_2-CH_2-OMgBr$ $3.$ Acidic hydrolysis and deprotection: $(CH_3O)_2CH-CH_2-CH_2-CH_2-CH_2-OMgBr \xrightarrow[heat]{H_3O^{+}} OHC-CH_2-CH_2-CH_2-CH_2OH$ In the final step,the acetal group $(CH_3O)_2CH-$ is hydrolyzed to an aldehyde group $OHC-$,and the alkoxide group is hydrolyzed to a primary alcohol $-CH_2OH$. The final product is $OHC-CH_2-CH_2-CH_2-CH_2OH$ ($5$-hydroxypentanal).

List-$I$	List-$II$
$A$. $C_6H_6 + CO + HCl \xrightarrow{AlCl_3} C_6H_5CHO$	$a$. Gattermann-Koch reaction
$B$. $C_6H_5CH_3 \xrightarrow{CrO_2Cl_2} C_6H_5CHO$	$b$. Etard reaction
$C$. $C_6H_5CH_2Br + CH_3Br \xrightarrow{Na/ether} C_6H_5CH_2CH_3$	$c$. Wurtz-Fittig reaction
$D$. $C_6H_6 + (CH_3)_2C = CH_2 \xrightarrow{H_2SO_4} C_6H_5C(CH_3)_3$	$d$. Friedel-Crafts alkylation

The final product of the following reaction sequence is: $(CH_3O)_2CH-CH_2-CH_2-CH_2-Br$ $\xrightarrow{Mg}$ $\xrightarrow{H_2C=O}$ $\xrightarrow[heat]{H_3O^{+}}$

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