Consider the molecule acetonitrile (CH 3 CN) 1. Which of the following must be o

Question

Consider the molecule acetonitrile (CH3CN)

1. Which of the following must be overcome during the boiling of acetonitrile?

1. dispersion forces

2. dipole-dipole forces

3. hydrogen bonds

Which of the following must be overcome during the boiling of acetonitrile?

1. dispersion forces

2. dipole-dipole forces

3. hydrogen bonds

2 only

1 and 3

1 and 2

1 only

1, 2, and 3

2.

Shown above are the shorthand structures of phenylacetic acid and 1-octadecylamine. Recall that lines represent two-electron bonds. Ends of lines and junctures represent carbon atoms. Finally, hydrogen atoms bonded to carbon are omitted for clarity.

The solubility of phenylacetic acid in acetonitrile is 3.87 M and the solubility of 1-octadecylamine in acetonitrile is 0.08 M

Select the response that BEST rationalizes the relative solubilities

a. The dispersion forces in 1-octadecylamine are very favorable

b. Phenylacetic acid can form hydrogen bonds with the nitrogen in acetonitrile while 1-octadecylamine cannot form hydrogen bonds with the nitrogen in acetonitrile

c. There are no favorable dipole-dipole interactions between acetonitrile and 1-octadecylamine

d. The molecular weight of phenylacetic acid is closer to the molecular weight of acetonitrile

2 only

1 and 3

1 and 2

1 only

1, 2, and 3

Explanation / Answer

Acetonitrile is well known as a polar aprotic solvent

so there is no any possibility of hydrogen bonding and london forcess

so answer is dipole-dipole forces 2 only

part -2

The dispersion forces in 1-octadecylamine are very favorable

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