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    Question

    Looking at the chemical formulae of these compounds,

    which is an alkane?
    A C3H8 Correct Answer Incorrect Answer
    B C2H4 Correct Answer Incorrect Answer
    C C5H10 Correct Answer Incorrect Answer
    D C6H10 Correct Answer Incorrect Answer

    Solution

    The general formula for alkane is CnH2n2. Checking the options, only option 1 with 3 carbons fits in this formula. n = 3, 2n+2= 2x3+2=8 Hence, C3H8 is the correct answer.

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