Assertion (A): Gabriel phthalimide synthesis can't be used for the preparation of aromatic primary amines.

Reason (R): The $\mathrm{C}-\mathrm{X}$ bond in aryl halides possess partial double bond character and hence ${\mathrm{X}}^{-}$can't be replaced by phthalimide ion.

The Gabriel Synthesis of amines is the reaction in which primary halides are converted into primary amines via ${\mathrm{SN}}^2$ reaction.

It is used for the preparation of primary amines only.

Now,

The $\mathrm{C}-\mathrm{X}$ bond present in haloarenes are difficult to break due to its partial double bond character.

Hence, option (A) is correct.