COMEDK2024Morning ShiftChemistryHydrocarbonsActual
Identify [ B ] and [ C ] formed in the reactions given below.
Options
- A[B] Propene [C] Propanal
- B[B] Propane [C] Ethanol
- C[B] Cyclopropane [C] Ethanal
- D[B] Propyne [C] Propanone
Correct answer
D. [B] Propyne [C] Propanone
Step-by-step solution
The starting material is C₃H₄Br₄ . This is a tetrabromo derivative of propane. Reaction with Zn dust (dehalogenation) leads to the formation of an alkyne. Specifically, CH₃-CBr₂-CHBr₂ or CH₂Br-CHBr-CH₂Br (though the formula C₃H₄Br₄ corresponds to CH₃-CBr₂-CHBr₂ or similar isomers) reacts with Zn dust to form propyne ( CH₃-C CH ) as product [B]. The reaction of propyne with Hg²⁺/H⁺ (Kucherov reaction) involves the hydration of the alkyne. The alkyne CH₃-C CH undergoes hydration to form an enol intermediate, which ta