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Which of the following alkanes is a gas at room temperature?

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Question: Which of the following alkanes is a gas at room temperature?

Options:

  1. Hexane
  2. Octane
  3. Decane
  4. Methane

Correct Answer: Methane

Solution: 

Methane is a gas at room temperature.

Which of the following alkanes is a gas at room temperature?

Practice Questions

Q1
Which of the following alkanes is a gas at room temperature?
  1. Hexane
  2. Octane
  3. Decane
  4. Methane

Questions & Step-by-Step Solutions

Which of the following alkanes is a gas at room temperature?
Correct Answer: Methane
  • Step 1: Understand what alkanes are. Alkanes are a type of hydrocarbon that consist only of carbon and hydrogen atoms, with single bonds between them.
  • Step 2: Know the general formula for alkanes, which is CnH(2n+2), where 'n' is the number of carbon atoms.
  • Step 3: Remember that alkanes can be gases, liquids, or solids depending on their molecular size.
  • Step 4: Identify the smallest alkane, which is methane (CH4).
  • Step 5: Recognize that methane is a gas at room temperature (around 20-25 degrees Celsius).
  • Step 6: Compare methane with larger alkanes (like ethane, propane, etc.) which are gases or liquids at room temperature.
  • Step 7: Conclude that methane is the only alkane that is a gas at room temperature.
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