To determine the correct molecular formula of iso-pentane, let's first understand the concept of isomers in chemistry.
Isomers are compounds that have the same molecular formula but differ in the arrangement of their atoms. Given that n-pentane (normal pentane) is one such isomer with the molecular formula [tex]\(C_5H_{12}\)[/tex], we need to deduce the molecular formula of its isomer, iso-pentane.
1. Identify the molecular formula of n-pentane:
The given molecular formula of n-pentane is [tex]\(C_5H_{12}\)[/tex].
2. Understand isomerism:
Since isomers have the same molecular formula but different structural arrangements, iso-pentane must have the same number of carbon (C) and hydrogen (H) atoms as n-pentane.
3. Compare the given molecular formula options:
- Option A: [tex]\(C_5H_{10}\)[/tex]
- Option B: [tex]\(C_5H_{12}\)[/tex]
- Option C: [tex]\(C_5H_{9}\)[/tex]
4. Ensure consistency with the concept of isomers:
Since n-pentane and iso-pentane are isomers, their molecular formulas must be identical.
Given these points, the correct molecular formula of iso-pentane is [tex]\(C_5H_{12}\)[/tex].
So, the correct answer is:
B. [tex]\(C_5H_{12}\)[/tex]
