Alkanes and Cycloalkanes Test

Result

Alkanes and Cycloalkanes Test - 1

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Question 1
1 / -0

Alkyl halides react with metallic sodium in dry ether to produce

A
alkanes with the same number of carbon atoms

B
alkanes with double the number of carbon atoms

C
alkenes with the same number of carbon atoms

D
alkenes with double the number of carbon atoms

Solution

This is an example of Wurtz reaction. It is a coupling reaction in organic chemistry, organometallic chemistry and recently in inorganic main group polymers, whereby two alkyl halides react with sodium to form a new carbon-carbon bond:

2 R - X + 2Na → R-R + 2Na⁺X⁻
Question 2
1 / -0

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

1. n-pentane

2. Isopentane

3. Neopentane

A
3 < 2 < 1

B
1 < 3 < 2

C
2 < 1 < 3

D
2 < 3 < 1

Solution

Correct order of boiling points is 3 < 2 < 1. The boiling point depends upon the surface area of the compound. As we know that there is no braching in n-pentane, one branching in isopentane and two branchings in neopentane. There is increase in branching which results in decrease in surface area. So, increasing order of boiling points is 3 < 2 < 1.
Question 3
1 / -0

The most strained cycloalkane is

A
cyclopropane

B
cyclobutane

C
cyclopentane

D
cyclohexane

Solution

Cyclopropane is the most strained cycloalkane on account of both angle strain and torsional strain.