NEETChemistryHydrocarbons
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Photochemical monochlorination of 2,2-dimethylbutane yields exactly four structurally isomeric products. Reason (R): The molecule of 2,2-dimethylbutane possesses three distinct sets of equivalent hydrogen atoms: nine primary hydrogens, two secondary hydrogens, and three other primary hydrogens. In
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
D. (A) is not correct but (R) is correct
Step-by-step solution
The structure of 2,2-dimethylbutane is CH ₃- C ( CH ₃)₂- CH ₂- CH ₃ . Let us identify the sets of equivalent hydrogen atoms in the molecule: First, the three methyl groups attached to C-2 are equivalent, providing a set of 9 primary hydrogens. Second, the methylene group at C-3 provides a set of 2 secondary hydrogens. Third, the terminal methyl group at C-4 provides a set of 3 primary hydrogens. Since there are exactly three distinct sets of equivalent hydrogen atoms, the photochemical monochlorination of 2,2-dimet