Given ΔH°ioniz (HCN) = 45.2 kJ mol–1 and ΔH°ioniz (CH3COOH) = 2.1 kJ mol–1. Which one of the following facts is true? 

1
pKa (HCN) = pKa(CH3COOH)
2
pKa (HCN) > pKa(CH3COOH)
3
pKa (HCN) < pKa(CH3COOH)
4
pKa (HCN) = (45.17/2.07) pKa(CH3COOH) 
5
Question Not Attempted

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