How many structural isomers, each containing a double bond, have the molecular formula C5H10?
A - VCE - SSCE Chemistry - Question 16 - 2008 - Paper 1
Question 16
How many structural isomers, each containing a double bond, have the molecular formula C5H10?
A. 3
B. 4
C. 5
D. 6
Worked Solution & Example Answer:How many structural isomers, each containing a double bond, have the molecular formula C5H10?
A - VCE - SSCE Chemistry - Question 16 - 2008 - Paper 1
Step 1
Identify the molecular formula
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Answer
The molecular formula given is C5H10. This indicates that the compound contains 5 carbon atoms and 10 hydrogen atoms.
Step 2
Determine the degree of unsaturation
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Answer
To find the degree of unsaturation, we can use the formula:
ext{Degree of Unsaturation} = rac{2C + 2 - H}{2}
where C is the number of carbons and H is the number of hydrogens. Substituting the values:
ext{Degree of Unsaturation} = rac{2(5) + 2 - 10}{2} = 1
This indicates the presence of one double bond or one ring.
Step 3
Enumerate possible structural isomers
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Answer
For C5H10, possible structural isomers with at least one double bond include:
1-Pentene
2-Pentene (cis and trans)
3-Pentene
Cyclopentane (with a double bond included in the structure).
Thus, we can identify a total of 4 structural isomers.
Step 4
Select the correct answer
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Answer
The total number of structural isomers with a double bond for C5H10 is 4. Therefore, the answer is B. 4.
