What is the structural formula of lithium tetrahydridoaluminate?

The correct option is Li[AlH4]. Lithium tetrahydridoaluminate, also known as lithium aluminum hydride (LAH), is a reducing agent commonly used in organic chemistry. Its structure consists of a lithium cation (Li+) and a tetrahydridoaluminate anion ([AlH4]-). The Al atom is at the center, bonded to four hydride (H-) ions. The negative charge on the [AlH4]- anion is balanced by the positive charge of the Li+ cation.