Boiling Point of Alkanes

Q. Which of the following has the highest boiling point ?

1. 1-chloropentane
2. 1-chloro-2-methylbutane
3. 2-chloro-3-methylbutane
4. All have equal boiling point

Q.

What effect does branching of an alkane chain has on its boiling point?

Q. The compound with the highest boiling point is:

1. n-pentane
2. n-hexane
3. 2-methylbutane
4. 2, 2-dimethylpropane

Q. The decreasing order of boiling points is

1. n-Pentane > iso-Pentane > neo-Pentane
2. Iso-Pentane > n-Pentane > neo-Pentane
3. Neo-Pentane > iso-Pentane > n-Pentane
4. n-Pentane > neo-Pentane > iso-Pentane

Q.

Which of the following components form an ideal solution?

1. Acetone and Benzene

2. Benzene and Toluene

3. Acetone and Ethanol

4. Ethanol and Water

Q. 20. if H3A is tribasic acid, assuming firsts disociation to be 100%, second dissociation 50%, third dissociation 20%.then find vonthoff factor (i) for H3A?

Q. The highest boiling point is expected for:

1. Isooctane
2. None of the above
3. n-Octane
4. 2, 2, 3, 3-tetramethylbutane

Q. Out of 2, 2-dimethylbutane, 2-methylpentane and 2, 3-dimethylbutane, which one has the highest boiling point?

1. $\text{2, 3-dimethylbutane > 2, 2-dimethylbutane > 2-methylpentane}$
2. $\text{2, 2-dimethylbutane > 2-methylpentane > 2, 2-dimethylbutane}$
3. $\text{2-methylpentane > 2, 2-dimethylbutane > 2, 3-dimethylbutane}$
4. $\text{2-methylpentane > 2, 3-dimethylbutane > 2, 2-dimethylbutane}$

Q. Which has the more boiling point 2 methyl pentane or 3 methyl pentane? Give reason.

Q. Arrange the following alcohols in the decreasing order of their boiling points.
1. n-Butyl alcohol
2. sec-Butyl alcohol
3. tert- Butyl alcohol

1. 1>2>3
2. 1>3>2
3. 2>1>3
4. 3>2>1

Q. Arrange the following in increasing order of boiling points.
(i) 3-methylpentane
(ii) 3-chloropentane
(iii) 3-bromopentane
(iv) 3, 3-dichloropentane

1. I < II < IV < III
2. I < II III < IV
3. II < I < IV < III
4. IV < III < II < I

Q.

Arrange the following compounds in increasing order of their boiling points.

(a) (ii) < (i) < (iii) (b) (i) < (ii) < (iii)

(c) (iii) < (i) < (ii) (d) (iii) < (ii) <(i)

Q. Which of the following compound has maximum boiling point

1. n-pentane
2. 2, 2-dimethyl propane
3. 2-methyl butane
4. n-hexane

Q.

Isomers of hexane, based on their branching, can be divided into three distinct classes as shown in the figure.

The correct order of their boiling point is

1. I > II > III

2. II > III > I

3. III > II > I

4. III > I > II

Q. Arrange the compounds in the order of decreasing boiling points.
1. Butane
2. 1, 2, 3-Pentane triol
3. Butyl alcohol

1. $1>2>3$
2. $2>3>1$
3. $1>3>2$
4. $2>1>3$

Q. Arrange the following compounds in the decreasing order of their boiling points
(i) Pentan -1- ol (ii) 2-methylbutan -2- ol (iii) 3- Methylbutan–2- ol.

1. (i) > (ii) > (iii)
2. (iii) > (ii) > (i)
3. (i) > (iii) > (ii)
4. (iii) > (i) > (ii)

Q. Arrange the compounds in the order of decreasing boiling points.
1. Ethanol
2. Propane
3. Pentanol

1. $1>3>2$
2. $3>2>1$
3. $1>2>3$
4. $3>1>2$

Q.

What effect does branching of an alkane chain has on its boiling point?

Q. Which of the following has maximum boiling point

1. n-octane
2. 2, 2, 3, 3-tetramethyl butane
3. n-butane
4. Iso-octane

Q. Which of the statement(s) regarding alkanes is/are correct?

1. All the alkanes are solids at room temperature ( 298 K )
2. Alkanes are colourless.
3. For a given molar mass , as the branching in alkane increases, boiling point increases.
4. Alkanes are insoluble in polar solvents.

Q. Arrange the following compounds in increasing order of their boiling points:
$\text{C}{\text{H}}_3\text{C}{\text{H}}_2\text{C}{\text{H}}_2\text{CHO,}\text{C}{\text{H}}_{\text{3}}\text{C}{\text{H}}_{\text{2}}\text{C}{\text{H}}_{\text{2}}\text{CH}{}_{\text{2}}\text{OH,}{\text{C}}_{\text{2}}{\text{H}}_{\text{5}}\text{O}{\text{C}}_{\text{2}}{\text{H}}_{\text{5}},\text{C}{\text{H}}_{\text{3}}\text{C}{\text{H}}_{\text{2}}\text{C}{\text{H}}_{\text{2}}\text{C}{\text{H}}_{\text{3}}$

Q. The increasing order of the boiling point of the major products A, B, and C of the following reaction will be:
(a) (b) (c) \( + HBr \longrightarrow C \)

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1. A < C < B
2. A < B < C
3. C < A < B
4. B < C < A

Q. The compound with the highest boiling point is:

1. n-pentane
2. n-hexane
3. 2-methylbutane
4. 2, 2-dimethylpropane

Q.

The correct order of decreasing the boiling point of the following alcohols is:

1. Pentan-1-ol
2. 2-methyl butan-2-ol
3. 3-methyl butan-2-ol

1. $\mathrm{I}>\mathrm{III}>\mathrm{II}$

2. $\mathrm{II}>\mathrm{III}>\mathrm{I}$

3. $\mathrm{I}>\mathrm{II}>\mathrm{III}$

4. $\mathrm{III}>\mathrm{II}>\mathrm{I}$

Q. The compound with highest boiling point is

1. n – hexane
2. n – pentane
3. 2, 2 – dimethyl propane
4. 2 – methyl butane

Q. Assertion :Among isomeric alkanes, branching increases the boiling points. Reason: branching lowers the intermolecular van der waals force of attraction.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is wrong but Reason is correct.

Q. Arrange the following compounds in increasing order of their boiling points.

Q.

Which of the following has maximum boiling point?

1. 

2. 

3. 

4. 

Q. Which of the following has maximum boiling point

1. Iso-octane
2. n-octane
3. 2, 2, 3, 3-tetramethyl butane
4. n-butane

Q. Assertion :Branched alkanes has lower boiling point than their unbranched isomers. Reason: Branched alkanes has relatively small surface area, so less London's dispersion force act among molecules.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason is correct