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Chapter 4: Q.43. (page 128)

Question: Rank the following alkanes in order of increasing boiling point.

Short Answer

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Answer

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01

Factor affecting boiling point

The boiling point in hydrocarbons decreases with the intermolecular force of attraction between the carbon atoms.

The more the branching in the molecule, the lesser the intermolecular forces of attraction between the carbon atoms, and the lower the boiling point.

02

Explanation

The second molecule among the given molecules has no branching. The third molecule has the highest branching, and the second molecule has the least branching.

Therefore, the boiling point is the highest for hexane and the least for 2,3-dimethylbutane.

The increasing order of boiling point

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Most popular questions from this chapter

Question: Draw a chair conformation of cyclohexane with one CH3CH2 group and one role="math" localid="1648542173942" CH3 group that fits each description.

  1. a 1,1-disubstituted cyclohexane with an axial role="math" localid="1648542231267" CH3CH2 group
  2. a cis-1,2-disubstituted cyclohexane with an axial role="math" localid="1648542270917" CH3 group
  3. a trans-1,3-disubstituted cyclohexane with an equatorial CH3 group
  4. a trans-1,4-disubstituted cyclohexane with an equatorialCH3CH2 group

Question: Classify each pair of compounds as constitutional isomers, stereoisomers, identical molecules, or not isomers of each other.

a.

b.

c.

d.

Question: Draw a second chair conformation for each cyclohexane. Then decide which conformation is present in higher concentration at equilibrium.

a.

b.

c.

Question: Draw the products of combustion of each alkane.

a.

b.

Question: Consider the tricyclic structure B.

(a) Label each substituent on the rings as axial or equatorial.

(b) Draw B using chair conformations for each six-membered ring.

(c) Label the atoms on the ring fusions (the carbons that join each set of two rings together) as cis or trans to each other.

B
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