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Basics of Organic Chemistry question

2009 · Shift 0 · Q4
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Basics of Organic Chemistry question

2009 · Shift 0 · Q4

JEE MainChemistryBasics of Organic ChemistryMCQ+4 / −1
The IUPAC name of neopentane is
  1. A
    2-methylbutane
  2. B
    2, 2-dimethylpropane
  3. C
    2-methylpropane
  4. D
    2,2-dimethylbutane
View written solutionFree

Correct answer: B

  1. Write the structure of neopentane

    Neopentane is the common name of the alkane with molecular formula C5H12C_5H_{12}C5​H12​ having the structure:

    C(CH3)4C(CH_3)_4C(CH3​)4​

    This means one central carbon is attached to four methyl groups.

  2. Find the longest continuous carbon chain

    In this structure, the longest continuous chain contains 3 carbon atoms.

    So the parent hydrocarbon is:

    propane\text{propane}propane

  3. Identify substituents

    On carbon number 222 of propane, there are two methyl groups attached.

  4. Write the IUPAC name

    Therefore, the IUPAC name is:

    2,2-dimethylpropane2,2\text{-dimethylpropane}2,2-dimethylpropane

  5. Check options

    • A: 222-methylbutane  this is isopentane, not neopentane.
    • B: 2,22,22,2-dimethylpropane  correct.
    • C: 222-methylpropane  this is isobutane.
    • D: 2,22,22,2-dimethylbutane  this has 666 carbons, not 555.

  6. Final answer

    The correct option is B: 2,2-dimethylpropane2,2\text{-dimethylpropane}2,2-dimethylpropane

  7. Comparison with stored correct answer

    Stored correct answer: B

    My derived answer also gives B, so they agree.

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