. Which one of the following ionic species has the greatest proton

affinity to form stable compound?

 greatest proton

Best Answer

Correct Option is: A

➔ Higher the proton affinity, the stronger the base and the weaker the conjugate acid. ➔ On moving towards right in a period in the periodic table, the basicity (proton affinity) decreases as the electronegativity of the atom possessing the lone pair of electrons increases. For this reason, NH2- is a stronger base than F-

➔ On moving down a group, basicity decreases due to increase in the atomic size. Hence basicity of I- < F-.

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