Out of Lowry Bronsted concept and Lewis concept, which is regarded as better and why?

Solution

Lewis concept of acids and basis is regarded as better than Bronsted concept due to the following reasons:
(i) Many species which are acids and bases according to Bronsted and Arrhenius concept are also covered by Lewis concept.
(ii) The acidic and basic character of certain species can be explained only with the help of Lewis concept. For example, acidic nature of CO₂ and basic nature of CaO can not be explained by any other concept except the Lewis concept.
(iii) According to Lewis concept, an acid need not contain the element hydrogen but it must be electron deficient in nature. For example AlCl₃ is an acid though it has no H⁺ion present.