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If the boiling point of n-C4H9NH2 is 351 K, what will be the boiling point of n-C4H9OH?

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in Chemistry – Class 12 by (188k points)
If the boiling point of n-C4H9NH2 is 351 K, what will be the boiling point of n-C4H9OH?

(a) 329 K

(b) 301 K

(c) 351 K

(d) 390 K

The question was posed to me in exam.

The question is from Amines Physical Properties topic in section Amines of Chemistry – Class 12

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The correct option is (d) 390 K

Easy explanation: Alcohols have higher boiling points than amines of comparable molecular masses. This is because the electronegativity of N is lower than that of O, which results in the OH bond in alcohols being more polar and hence stronger (in hydrogen bonding) than the N-H bond in amines.

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