Identify the alkyne in the following sequence | vedclass

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Question

(A) The reaction sequence is: $	ext{Alkyne}$ $\xrightarrow{H_2, 	ext{Lindlar's catalyst}} A$ $\xrightarrow{	ext{Ozonolysis}} B 	ext{ (only)}$.In t

Vedclass · Accepted Answer

$H_3C-C \equiv C-CH_3$

Vedclass · Answer

(A) The reaction sequence is: $	ext{Alkyne}$ $\xrightarrow{H_2, 	ext{Lindlar's catalyst}} A$ $\xrightarrow{	ext{Ozonolysis}} B 	ext{ (only)}$.In the Wacker process,ethene $(CH_2=CH_2)$ is oxidized to acetaldehyde $(CH_3CHO)$,which is $B$.Since ozonolysis of alkene $A$ yields $B$ $(CH_3CHO)$ only,$A$ must be $CH_3CH=CHCH_3$ (but$-2-$ene).Lindlar's catalyst reduces an alkyne to a $cis$-alkene.Therefore,the starting alkyne must be $CH_3-C \equiv C-CH_3$ (but$-2-$yne).

Identify the alkyne in the following sequence of reactions:

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