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In (A) the negative charge is present on electropositive C atom that's why resonating structure 2 is more stable.
In (B) the resonating structure 1 has charge on it and as there is presence of charge it's unstable thus resonating structure 2 is more stable.
In (C) Oxygen is more electronegative than Nitrogen and since the positive charge is present on more electronegative atom (Oxygen) thus resonating structure 1 is comparatively more stable.
In (D) positive charge is present on electropositive atom Carbon of resonating structure 1 and in resonating structure 2 +ve charge is on electronegative atom making it unstable, hence resonating structure 1 is more stable.
Thus answer is (C) and (D)
In (B) the resonating structure 1 has charge on it and as there is presence of charge it's unstable thus resonating structure 2 is more stable.
In (C) Oxygen is more electronegative than Nitrogen and since the positive charge is present on more electronegative atom (Oxygen) thus resonating structure 1 is comparatively more stable.
In (D) positive charge is present on electropositive atom Carbon of resonating structure 1 and in resonating structure 2 +ve charge is on electronegative atom making it unstable, hence resonating structure 1 is more stable.
Thus answer is (C) and (D)
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