Question

Which of the following statements are correct ?
(i) Primary amines show more intermolecular association than secondary amines
(ii) Tertiary amines do not show intermolecular association
(iii) Boiling points of isomeric alkenes follow the order $3^{\circ }>2^{\circ }>1^{\circ }$

• A. $(i)$ and $(iii)$
• B. $(i)$ and $(ii)$
• C. $(i),(ii)$ and $(iii)$
• D. $(ii)$ and $(iii)$

Answer 1

Answer: (B)

Primary and secondary amines are engaged in intermolecular association due to hydrogen bonding between nitrogen of one and hydrogen of another molecule. This intermolecular association is more in primary amines than in secondary amines as there are two hydrogen atoms available for hydrogen bond formation in it. Tertiary amines do not have intermolecular association due to the absence of hydrogen atom available for hydrogen bond formation. Therefore, the order of boiling points of isomeric amines is as follows :
Primary > Secondary > Tertiary