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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

Step by step solution

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: Although penicillin G has two amide functional groups, one is much more reactive than the other. Which amide is more reactive and why?

Question: Consider rotation around the carbon-carbon bond in 1,2-dichloroethane (ClCH2CH2Cl).

a.Using Newman projections, draw all of the staggered and eclipsed conformations that result from rotation around this bond.

b. Graph energy versus dihedral angle for rotation around this bond.

Arrange the following compounds in order of increasing boiling point.

Question: Convert each structure to a Newman projection around the bond highlighted in pink.

a.

b.

c.

Question: Which conformation in each pair is higher in energy? Calculate the energy difference between the two conformations using the values given in Table 4.3.

a.

b.
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