The boiling points of ethane (C2H6), methyl amine (CH3NH2), methylfluorine (CH3F

Question

The boiling points of ethane (C2H6), methyl amine (CH3NH2), methylfluorine (CH3F), and lithium fluoride (LiF) are (in random order): -89oC, -78oC, -6oC, and +1673oC. Using the attached sheet if needed, answer the following questions. a. Which of the compounds is most likely to have the boiling point of -6oC? ________________________ b. Which of the compounds would have only London forces as possible intermolecular forces between its molecules? ________________________ c. Which of the compounds could have hydrogen bonds as possible intermolecular forces between its molecules? ________________________ d. Which of the compounds is most likely to have the boiling point of -78oC? ________________________

Explanation / Answer

a)   answer : CH3NH2

reason .: boiling points order : LiF (1673) > CH3NH2 (-6) > CH3F(-78) > C2H6(-89). LiF is having more boiling point it is due to LiF is ionic compound

b) answer : C2H6

reason : it has only dispersion forces it is due to no polar bonds are present in C2H6 molecule

c) answer : CH3NH2

reason : due to H-bond in CH3NH2 it has next boiling point to the LiF

d) answer : CH3F

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