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Reshav posted an Question
October 25, 2020 • 23:30 pm 30 points
  • IIT JAM
  • Chemistry (CY)

Can i get detailed mechanism of how option c is correct

4G 5:16 PM 4 85% Report Question3 Show Passage What reagent is needed for the following reaction? a. (A) H2/Lindlar's Catalyst b. (B) (1) Li in NHa (2) NH4 C1 c. (C) Ha/NigB d (D) (a) and (c) 00:01:23 Explanation Status More

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    Priyanshu kumar

    The H2 is adsorbed by the surface of Ni2B. Similarly the molecules of alkyne are adsorbed by surface of Ni2B. Slowly stepwise the adsorbed hydrogen and the adsorbed alkyne forms bond and syn-addition takes place before the organic molecule leaves the catalyst surface. As a consequence, both hydrogen atoms usually add from the same side of molecule which results in formation of cis-alkene (or Z-alkene). Similar reaction is hydrogenation of alkene using Pt as catalyst, it is also syn addition.

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    Dinesh khalmaniya 1 best-answer

    option D Ni2B (P-2 Catalyst) is used as a surface for the reaction to take place (as it contains free electrons). The H2 is adsorbed by the surface of Ni2B. Similarly the molecules of alkyne are adsorbed by surface of Ni2B. Slowly stepwise the adsorbed hydrogen and the adsorbed alkyne forms bond and syn-addition takes place before the organic molecule leaves the catalyst surface. As a consequence, both hydrogen atoms usually add from the same side of molecule which results in formation of cis-alkene (or Z-alkene). Similar reaction is hydrogenation of alkene using Pt as catalyst, it is also syn addition. lindlar catalyst on reduction of alkyne to give cis alkene.

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