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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: Draw the products of combustion of each alkane.

a.

b.

Question: Draw the five constitutional isomers having molecular formula C6H14.

Question: Rank the following conformations in order of increasing energy.

Question: Answer the following questions about compound A, which contains a -CH3group and OH group bonded to the carbon skeleton that consists of three six-membered rings in the conformation shown.

a. Are the -CH3and OH groups oriented cis or trans to each other?

b. Is a substituent on localid="1648626189057" Cathat is cis to the CH3 group located in the axial or equatorial position?

c. Is an equatorial Br at Cboriented cis or trans to the OH group?

d. Is the H atom on Cclocated cis or trans to the OH group?

e. Is a substituent on Cdthat is trans to the OH group located in the axial or equatorial position?

Question: Review classifying carbons and hydrogens in Section 3.2, and draw the structure of an alkane with molecular formula C7H16 that contains

a. one 40carbon;

b. only 10 and 20 carbons;

c.10 , 20, and 30 hydrogens.
See all solutions

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