For the reaction,
2SO₂(g) + O₂(g) = 2SO₃(g), $$\Delta $$H = –57.2 kJ mol^–1 and K_C = 1.7 × 10¹⁶
Which of the following statement is incorrect ?

The correct order of the first ionization enthalpies is :

The ratio of the shortest wavelength of two spectral series of hydrogen spectrum is found to be about 9. The spectral series are :

Compound A(C₉H₁₀O) shows positive iodoform test. Oxidation of A with KMnO₄/KOH given acid B(C₈H₆O₄). Anhydride of B is used for the preparation of phenolphthalein. Compound A is: