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How many different alkenes with molar mass 84 upon hydrogenation can give 3-methyl pentane?
    Correct answer is '5'. Can you explain this answer?
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    Understanding the problem:
    To find the number of different alkenes with a molar mass of 84 that can give 3-methyl pentane upon hydrogenation, we need to consider the structural isomers of the alkene.

    Identifying the key points:
    1. Molar mass of alkene = 84 g/mol
    2. Structure of 3-methyl pentane = CH3CH(CH3)CH2CH3

    Finding the solution:
    - First, we need to determine the molecular formula of the alkene that corresponds to a molar mass of 84 g/mol. Since hydrogenation adds 2 hydrogens to an alkene, the original molecular formula of the alkene would be CnH2n.
    - The molecular formula of an alkene with a molar mass of 84 g/mol would be CnH2n = 84. By solving this equation, we find that n = 7.
    - Therefore, the molecular formula of the alkene is C7H14.
    - Now, we need to consider the structural isomers of C7H14 that can give 3-methyl pentane upon hydrogenation.
    - The structural isomers that can give 3-methyl pentane upon hydrogenation are:
    1. 3-methylhexene
    2. 2-methylhexene
    3. 3-ethylpentene
    4. 2,3-dimethylbutene
    5. Cyclohexene

    Conclusion:
    There are 5 different alkenes with a molar mass of 84 that can give 3-methyl pentane upon hydrogenation.
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    How many different alkenes with molar mass 84 upon hydrogenation can give 3-methyl pentane?Correct answer is '5'. Can you explain this answer?
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