The curved arrow mechanism for the reaction as described is as represented in the attached image.
Nitrile reduction by LiAlH4
Nitriles, upon reaction with LiAlH4 can be converted to 1° amines.
Opon occurrence of this reaction, the hydride nucleophile attacks the electrophilic carbon in the nitrile to form an imine anion. Once stabilized by a Lewis acid-base complexation the imine salt can accept a second hydride to form a dianion.
On this note, the nitrile reduction of 4-methyl pentanenitrile and lialh4, followed by the addition of acid to give the major product is as represented in the attached image.
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