O Levels Chemistry (5070)•5070/11/M/J/25
Explanation
Defining Features of Alkanes
Steps:
- Define alkanes as hydrocarbons with the general formula CₙH₂ₙ₊₂.
- Verify statement 1: Alkanes consist solely of carbon and hydrogen atoms.
- Verify statement 2: Their structure includes only C-C and C-H single covalent bonds.
- Verify statement 3: As hydrocarbons without multiple bonds, they are saturated.
Why A is correct:
- Alkanes are defined as saturated hydrocarbons (no double/triple bonds) made of carbon and hydrogen linked by single covalent bonds, matching all three statements.
Why the others are wrong:
- B: Omits statement 3, but alkanes are saturated by definition.
- C: Omits statement 1, but alkanes contain only C and H.
- D: Omits statements 1 and 2, both core to alkane composition and bonding.
Final answer: A
Topic: Alkanes
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