The correct order of increasing basicity of the given conjugate bases `(R=CH_(3))` is

Options

A. `RCOO^(-) lt NH_(2) ^(-) lt HC -= C ^(-) lt R^(-)`
B. `RCOO^(-) lt HC -= C^(-) NH_(2)^(-) lt NH_(2)^(2_ lt R^(-)`
C. `RCOO^(-) lt HC -= C^(-) lt R^(-) lt NH_(2)^(-)`
D. `R^(-) lt HC-= C^(-) lt RCOO^(-) lt NH_(2)^(-)`

Answer

B

Explanation

Stronger the acid , weaker is the conjugate base
base + proton `to` conjugate acid
Conjugate acid formed will be ` : RCOOH ,NH_3 ,HC -= CH ,CH_4`
Acidic strength follows order
` RCHOOH gt HC -= H gt NH_3 gt CH_4`
` therefore ` increasing besicity will be :
` RCOO^(-) lt HC -= C^(-) lt NH_(2)^(-) lt R^(-)`