Arrange the following in the order of decreasing basic character A) RCOO¯   B)CH≡C⊝   C)  N⊝H2 D)   O¯H

From the Concept of Bronsted - Lowry acid-Base stronger acid/base conjugate substance will be weaker in nature and vice-versa. RCOOH is strongest acid than and hence RCOO¯  weak base and NH2−strong basic in nature.