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If the Kb values of ammonia, methylamine and ethylamine are x, y and z respectively, identify the correct relation between x, y and z from the following.

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in Chemistry – Class 12 by (188k points)
If the Kb values of ammonia, methylamine and ethylamine are x, y and z respectively, identify the correct relation between x, y and z from the following.

(a) x > y

(b) y < z

(c) x > z

(d) x > y > z

The question was posed to me in an interview.

My question is taken from Amines Chemical Reactions in portion Amines of Chemistry – Class 12

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Right answer is (b) y < z

Easiest explanation: Larger the value of Kb, stronger is the base. Since ethylamine is a stronger base than methylamine which is stronger than ammonia, due to the effect of alkyl groups, the Kb vale of methylamine will be less than that of ethylamine (y<z).

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