Compound from the following that will not produce precipitate on reaction with Compound from the following that will not produce precipitate on reaction with AgNO3 is:
The reaction with \( \text{AgNO}_3 \) is used to test for halide ions. A precipitate of \( \text{AgBr} \) (pale yellow) will form if a bromide ion is available to react with \( \text{Ag}^+ \).
Analysis of the Options:
Option 1: Cyclopropyl bromide
The \( \text{C-Br} \) bond in cyclopropyl bromide is not easily broken.
The carbocation \( \text{C}^+_3 \) formed upon the removal of bromide is stabilized by aromatic nature.
Hence, it does not readily form a precipitate with \( \text{AgNO}_3 \).
Option 2: Bromobenzene
The \( \text{C-Br} \) bond in aryl halides is strong due to resonance and the \( \text{sp}^2 \) hybridization of carbon.
This bond does not readily break to release bromide ions.
The carbocation \( \text{C}^+_2 \) is not formed as it is highly unstable.
Thus, bromobenzene does not react with \( \text{AgNO}_3 \) to form a precipitate.
Option 3: Benzylic bromide
In benzylic bromide, the benzylic carbocation formed after the removal of bromide ion is stabilized by resonance with the benzene ring.
This makes the bromide ion readily available to react with \( \text{Ag}^+ \), forming a precipitate.
Option 4: Allylic bromide
In allylic bromide, the allylic carbocation formed is stabilized by resonance.
This allows the bromide ion to react with \( \text{Ag}^+ \), forming a precipitate.
Conclusion:
Final Answer: Bromobenzene will not produce a precipitate with \( \text{AgNO}_3 \).
