Final answer:
The Lewis bases in the given compounds are Cl⁻, NH₄⁺, and Mn²⁺.
Step-by-step explanation:
In this question, we need to determine which of the given compounds is a Lewis base. A Lewis base is a species that can donate a pair of electrons. By definition, a Lewis base is an electron pair donor. Based on this definition, the compounds Cl⁻, NH₄⁺, and Mn²⁺ can all act as Lewis bases because they have electron pairs that they can donate. Therefore, the correct answer is option 1) Cl⁻, option 3) NH₄⁺, and option 5) Mn²⁺.