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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: Classify the ring carbons as up C’s or down C’s. Identify the bonds highlighted in bold as axial or equatorial.

Question: Classify each pair of compounds as constitutional isomers or identical molecules.

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Question: The eclipsed conformation of CH3CH2Cl is role="math" localid="1648620042367" 15kJ/mol less stable than the staggered conformation. How much is the H, Cl eclipsing interaction worth in destabilization?

Question: Cyclopropane and cyclobutane have similar strain energy despite the fact that the C-C-C bond angles of cyclopropane are much smaller than those of cyclobutane. Suggest an explanation for this observation, considering all sources of strain discussed in Chapter 4.

Question: Considering rotation around the bond highlighted in pink in each compound, draw Newman projections for the most stable and least stable conformations.

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