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(C) Gabriel phthalimide synthesis is a method used to prepare pure primary amines. $1$. Phthalimide is reacted with alcoholic $KOH$ to form potassium

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$HCl$

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(C) Gabriel phthalimide synthesis is a method used to prepare pure primary amines. $1$. Phthalimide is reacted with alcoholic $KOH$ to form potassium phthalimide. $2$. Potassium phthalimide is then reacted with an alkyl halide to form $N$-alkyl phthalimide. $3$. Finally,$N$-alkyl phthalimide undergoes alkaline hydrolysis using aqueous $NaOH$ to yield the primary amine and phthalic acid (as a salt). $HCl$ is not used in this process as the final step requires basic hydrolysis to release the amine.

Gabriel phthalimide synthesis is used in the preparation of primary amines from phthalimide. Which of the following reagents is not used during the process?

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