Propyne and propene can be distinguished byA. Conc. `H_2SO_4`B. `Br_2` – InterviewSolution

InterviewSolution

1.	Propyne and propene can be distinguished byA. Conc. `H_2SO_4`B. `Br_2` in `C Cl_4`C. Alk. `KMnO_4`D. `AgNO_3` in `NH_3`
Answer» Correct Answer - D Propene and propyne, both are unsaturated hence give positive test with conc. `H_2SO_4, Br_2//C Cl_4` and alk. `KMnO_4` (addition reaction ) . With ammonical `AgNO_3` , only terminal alkynes (like acetylene, propyne etc.) react. Alkenes do not react with this reagent. The reason is that alkynes have acidic hydrogen. `CH_3C-=CH+AgNO_3 + 2NH_4OH to 2CH_3 - C-=C` `Ag darr + 2NH_4 +2H_2O`

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