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(B) Gabriel-phthalimide synthesis is a standard method for the preparation of pure primary aliphatic amines.$II$. Hoffmann bromamide degradation react

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$I$ & $II$ only

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(B) Gabriel-phthalimide synthesis is a standard method for the preparation of pure primary aliphatic amines.$II$. Hoffmann bromamide degradation reaction is used to convert an amide into a primary amine with one carbon atom less.$III$. Carbylamine reaction is a test for primary amines,not a preparation method.$IV$. Sandmeyer reaction is used to convert diazonium salts into aryl halides,not for preparing aliphatic amines.Therefore,only $I$ and $II$ are used for the preparation of aliphatic primary amines.

Which of the following reactions are used in the preparation of aliphatic primary amines?
$I$. Gabriel-phthalimide reaction
$II$. Hoffmann Bromamide reaction
$III$. Carbylamine reaction
$IV$. Sandmeyer reaction

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Which of the following reactions are used in the preparation of aliphatic primary amines?$I$. Gabriel-phthalimide reaction$II$. Hoffmann Bromamide reaction$III$. Carbylamine reaction$IV$. Sandmeyer reaction