Which of the following reactions is correct?

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(B) Let's analyze each reaction:$A$. $n-hexane \xrightarrow[\Delta]{Cr_2O_3+Al_2O_3} 	ext{benzene} + 4H_2$. The product shown in the image is cyclohe

Vedclass · Accepted Answer

$3CH \equiv CH \xrightarrow[	ext{Red hot}]{	ext{Fe tube}} 	ext{benzene}$

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(B) Let's analyze each reaction:$A$. $n-hexane \xrightarrow[\Delta]{Cr_2O_3+Al_2O_3} 	ext{benzene} + 4H_2$. The product shown in the image is cyclohexane,which is incorrect. The correct product is benzene.$B$. $3CH \equiv CH \xrightarrow[	ext{Red hot}]{	ext{Fe tube}} C_6H_6$ (benzene). This is a standard cyclotrimerization reaction of ethyne,which is correct.$C$. $but-2-ene \xrightarrow[\Delta]{H_2/Ni} 	ext{butane}$. While the reaction is chemically possible,the image shows a specific skeletal structure. However,option $B$ is a classic,textbook-defined reaction.$D$. $CH_3-C \equiv C-CH_3 \xrightarrow[Pd(OOCCH_3)_2]{H_2/Pd-CaCO_3} 	ext{cis-but-2-ene}$. This is the Lindlar reduction of an internal alkyne to a cis-alkene,which is also correct. Given the context of standard chemistry questions,$B$ is the most fundamental reaction taught in this topic.

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