The IUPAC name of CH3CH2CHClCH3 is
Correct answer: B. 2-chlorobutane
- A. 1-chlorobutane
- B. 2-chlorobutane
- C. 3-chlorobutane
- D. 2-chloropropane
Explanation
The longest chain has four carbons, giving butane, and numbering from the end that puts the chlorine on the lower numbered carbon makes it position 2 rather than position 3. Naming it 3-chlorobutane means numbering from the wrong end, which is the standard error. The rule is always to give substituents the lowest possible locants.
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About Nomenclature, Structure and Reactivity
Alkyl halides are named by selecting the longest carbon chain and locating the halogen substituent, while their structures are classified as primary, secondary or tertiary. Their reactivity includes nucleophilic substitution and elimination, with the behaviour of leaving groups and the distinction between SN1 and SN2 mechanisms linked to substrate structure.
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IUPAC name of (CH3)3CCH2Br is