Question

Rank the four compounds above that contain two carbons from lowest to highest boiling point.
a. ethane C2H6
d. methoxymethane C2H6O (CH3OCH3)
b. ethanol C2H6O (CH3CH2OH)
f. 1-octanol C8H18O (CH3CH2CH2CH2CH2CH2CH2CH2OH)
c. ethanoic acid C2H4O2 (CH3COOH)

Answer 1

Answer on Question#76780 – Chemistry – Organic chemistry

Question:

Rank the four compounds above that contain two carbons from lowest to highest boiling point.

a. ethane $\mathrm{C}_2\mathrm{H}_6$

d. methoxymethane $\mathrm{C}_2\mathrm{H}_6\mathrm{O}$ (CH3OCH3)

b. ethanol $\mathrm{C}_2\mathrm{H}_6\mathrm{O}$ (CH3CH2OH)

f. 1-octanol $\mathrm{C_8H_{18}O}$ (CH3CH2CH2CH2CH2CH2CH2OH)

c. ethanoic acid $\mathrm{C_2H_4O_2}$ (CH3COOH)

Solution:

1. Find four compounds that contain two carbons. They are:

a. ethane $\mathrm{C}_2\mathrm{H}_6$

d. methoxymethane $\mathrm{C}_2\mathrm{H}_6\mathrm{O}$ (CH3OCH3)

b. ethanol $\mathrm{C}_2\mathrm{H}_6\mathrm{O}$ (CH3CH2OH)

c. ethanoic acid $\mathrm{C}_2\mathrm{H}_4\mathrm{O}_2$ (CH3COOH)

2. Rank the compounds from lowest to highest boiling point. A compound that have the lowest boiling point is ethane $\mathrm{C}_2\mathrm{H}_6$ , because it has the lowest molar mass and contains only carbon and hydrogen atoms. The next compound is methoxymethane $\mathrm{C}_2\mathrm{H}_6\mathrm{O}$ ( $\mathrm{CH}_3\mathrm{OCH}_3$ ), it contains also oxygen and has higher molar mass than ethane, but molecules of methoxymethane do not form hydrogen bonds. The next compound ethanol $\mathrm{C}_2\mathrm{H}_6\mathrm{O}$ has molar mass the same that methoxymethane, but ethanol contains alcohol group -OH that form hydrogen bonds with other molecules. The last compound (compound with highest boiling point) is ethanoic acid. It has the highest molecular mass and has ability to form the most effective hydrogen bonds. It even exist as a dimer:

Answer provided by https://www.AssignmentExpert.com