NEETChemistryAmines
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Fluorobenzene is prepared by heating dry benzenediazonium fluoroborate rather than benzenediazonium chloride. Reason (R): Benzenediazonium fluoroborate is water insoluble and stable in the dry state at room temperature, whereas the chloride salt decomposes easily in the dry state. In the light of t
Options
- ABoth (A) and (R) are true but (R) is not the correct explanation of (A)
- BBoth (A) and (R) are true and (R) is the correct explanation of (A)
- C(A) is true but (R) is false
- D(A) is false but (R) is true
Correct answer
B. Both (A) and (R) are true and (R) is the correct explanation of (A)
Step-by-step solution
Assertion (A) is true: Fluorobenzene is prepared by the Balz-Schiemann reaction, which involves heating dry benzenediazonium fluoroborate. Reason (R) is true: According to NCERT, benzenediazonium fluoroborate is water insoluble and stable at room temperature. This allows it to be precipitated, filtered, dried, and safely heated. In contrast, benzenediazonium chloride is soluble in water and decomposes easily in the dry state, making it unsafe and impractical to isolate and heat dry. Therefore, the stability and ins