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Which of the following will be most stable diazonium salt RN2+X−?

1. CH3N2+X−
2. C6H5N2+X−
3. CH3CH2N2+X−
4. C6H5CH2N2+X−

Correct answer: C6H5N2+X−

Solution

The stability of diazonium salts depends on the resonance stabilization of the aryl group. C6H5N2+X− (benzene diazonium salt) is the most stable due to resonance stabilization of the positive charge by the aromatic ring.

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