Increasing order of basicity:

Question

Canvas Classes · Accepted Answer

Step 1: Basic Strength of Anions
Basicity is the tendency to donate a lone pair. It is inversely proportional to the stability of the anion.
- (v) Cyanide (): Stabilized by high EN of Nitrogen and triple bond. (Weakest base).
- (iii) Ethynyl ():  carbon. (Very stable).
- (ii) Vinyl ():  carbon.
- (iv) Methyl ():  carbon. (Strong base).
- (i) tert-butoxide (): Although Oxygen is EN, the  effects and steric bulk make it a very strong base in non-polar contexts (strongest here).

Step 2: Order
(v)

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