NEETChemistryGeneral Organic Chemistry
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The IUPAC name of the compound CH ₃- C ( CH ₃)₂- CH ₂- CH = CH - CH ₃ is 5,5-Dimethylhex-2-ene. Reason (R): In the IUPAC nomenclature of alkenes, the parent chain must contain the maximum number of carbon atoms including the double bond. In the light of the above statements, choose the most appropr
Options
- ABoth (A) and (R) are correct and (R) is the correct explanation of (A)
- BBoth (A) and (R) are correct but (R) is not the correct explanation of (A)
- C(A) is correct but (R) is not correct
- D(A) is not correct but (R) is correct
Correct answer
B. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
Step-by-step solution
Assertion (A) is correct. The longest carbon chain containing the double bond has 6 carbon atoms. Numbering is done from the right side to give the lowest possible locant to the principal functional group (the double bond), which gets position 2. If numbered from the left, the double bond would be at position 4. Thus, the correct IUPAC name is 5,5-Dimethylhex-2-ene. Reason (R) is also correct as a general rule of IUPAC nomenclature, but it does not explain the specific numbering direction chosen in the Assertion. T