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The incorrect IUPAC name is

1. CH3 – CH2 – CH – CH3 | CH3 (2-Methyl-3-butane)
2. CH3 – CH – CH – CH3 | CH3 CH2CH3 (2,3-Dimethylpentane)
3. CH3 – CH – CH – CH3 | Cl Br (2-Bromo-3-chlorobutane)
4. CH3 – C ≡ CCH(CH3)2 (4-Methyl-2-pentyne)

Correct answer: CH3 – CH2 – CH – CH3 | CH3 (2-Methyl-3-butane)

Solution

Option A is incorrect because the correct IUPAC name for the compound is 2-Methylbutane, not 2-Methyl-3-butane. The numbering should ensure the substituent gets the lowest possible number.

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