Which of the following molecule/ion has all the three types of bonds, electrovalent, covalent and co-ordinate: Cl⁻, HCl, H₂O₂, NH₄⁺Cl⁻?

NH₄⁺Cl⁻ molecule has all the three types of bonds, electrovalent, covalent and co-ordinate. One N−H bond is a coordinate bond and three N−H bonds are covalent bonds. Electrovalent (ionic) bond is present between ammonium ion and chloride ion. HCl and H₂O₂ contain covalent bonds only. Cl⁻ ion is a monoatomic ion, hence no bond is present.