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Priyanshu kumar Best Answer
LiAlH4 reduces a C-C double bond which is in conjugation i.e. resonance. Also LiAlH4 does not reduces aromatic double bond even though it is in conjugation.
Neither LiAlh4 nor nabh4 reduces isolated double bond
lialh4 and nabh4 are hydride based reagents so it doesn't easily reduce isolated double bond
LiAlH4 and NaBH4 can be thought of as providing hydride ions, H−. These cannot attack an electron rich carbon-carbon double bond, or be attacked by a pair of negative electrons from a pi orbital.