Please check it out within 30 minutes. Please provide explanation or working so

Question

Please check it out within 30 minutes. Please provide explanation or working so I can check with my answer. I thought it is c - the greater the viscosity the higher the boiling point? I could be wrong though.

Question: Arrange the following molecules in order of increasing viscosity.

1. CH4     2. CH3CH2C(H)=CH2     3. CH3CH2C(CH3)3      4. CH3CH2CH2CH2CH2CH3

Select 1:

a. 4 < 3 < 2 < 1

b. 2 < 1 < 4 < 3

c. 1 < 2 < 3 < 4

d. 1 < 4 < 3 < 2

e. 3 < 1 < 2 < 4

Explanation / Answer

Correct option: C (as you predicted)

At some extent boiling points and viscosity can be correlated.

For substances, viscosity is the resistance of a liquid to flow. It depends upon the intermolecular forces (such forces are hydrogen bonding, dipole induced interactions, van der Waals forces etc.). With greater intermolecular forces molecules are more strongly attached to each other and hence, they do not flow easily. Among the above mentioned compounds, CH4 is non polar and hence, there is very weak intermolecular intereactions making it gas at room temperature so least viscosity. For isomeric alkanes, branched one (option 3) has less intermolecular interaction rather than linear chain (n-hexane, option 4) as linear chain alkane has greater intermolecular interactions than brabnced due to more surface area.

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