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Simun Mishra posted an Question

November 16, 2020 • 15:48 pm

30 points

IIT JAM
Chemistry (CY)

Can u pls explain me this question ?

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Dinesh khalmaniya 1 Best Answer

option B Alkynes are selectively converted into trans alkenes when they are reduced by a solution of sodium (or lithium) in liquid ammonia that contains stoichiometric amounts of an alcohol, such as ethanol.
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sir pph3 = CH2 use for the reduction of ........?
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wittig reaction
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sir can u pls explain me only question I can't understand what the question ask
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yes wait
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can you share this question as a new query?
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ok sir
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Priyanshu kumar

option B
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but sir birch reduction is for conjugated alkyne and alkene na
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I can't understand sir pls explain it
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ok wait
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ok sir and sir why not lindlar catalysts use here
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simun here it is asked effective so Na /liq Nh3 give effective reduction
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H2/lindlar catalyst always gives the cis-alkene, in contrast to Na/NH3, which gives the trans alkenes
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Here trans alkene is asked so Na/Nh3 is used
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which give cis alkene ?
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H2/lindlar catalyst- cis alkene
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but sir here no conjugation so how here negative charge and redical minimise the repulsion
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check the mechanism simun
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so sir all alkyne and alkene without conjugation also reduce to trans by this
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and sir ph3p=CH2 is used for reducing of ?
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this is wittig reagent ...you have read the mechanism of wittig reaction earlier
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yes simun
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tq sir
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welcome and please accept the answer
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??
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