Questions: Below are several constitutional isomers with the molecular formula C6H14. Which of these isomers will have the largest heat of combustion?

Below are several constitutional isomers with the molecular formula C6H14. Which of these isomers will have the largest heat of combustion?
Transcript text: Below are several constitutional isomers with the molecular formula $\mathrm{C}_{6} \mathrm{H}_{14}$. Which of these isomers will have the largest heat of combustion?
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Solution

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Solution Steps

Step 1: Identify the Isomers

The given molecular formula is C8H18. The isomers shown are different structural arrangements of this formula.

Step 2: Understand Heat of Combustion

The heat of combustion is the energy released when a compound undergoes complete combustion with oxygen. For alkanes, the more branched the isomer, the lower the heat of combustion.

Step 3: Analyze the Structures
  • The first structure is a straight-chain alkane (octane).
  • The second structure is a branched alkane with one branch.
  • The third structure is a more highly branched alkane.

Final Answer

The straight-chain alkane (first structure) will have the largest heat of combustion because it is the least branched.

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