Himanshu bhaiyya, sorry to say but ur figure and hence explanation for first compound is wrong. Look at the question again. In the figure, U hav taken the starting compound wrong. Think urself how can N form 4 bonds without a +ve charge on itself? Actuallu the compound (b) in ur figure is the original compound given in the question. And it can't accept any more H+ and hence will be most acidic and least basic.
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