Question

how to convert pent-1-ene to pent-2-yne

Answer 1

By addition reaction you can add an hydrogen atom and make this unsaturated to saturated from pentyne to pentene.
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Answer 2

The process of conversion of pent-1-ene to pent-2-yne is as follows -

• According to the IUPAC nomenclature of chemical compounds, the symbol of pent-1-ene is $CH_{2}=CH-CH_{2}-CH_{2}-CH_{3}$ and the symbol of pent-2-yne is $CH_{3}-C\equiv C-CH_{2}-CH_{3}$ .
• In the first step, we will add HBr to pent-1-ene.
• $CH_{2}=CH-CH_{2}-CH_{2}-CH_{3} \rightarrow^{HBr} \ CH_{3}-CH(Br)-CH_{2}-CH_{2}-CH_{3}$ .
• In the second step, we will add alcoholic KOH to the previous product.
• $CH_{3}-CH(Br)-CH_{2}-CH_{2}-CH_{3}\rightarrow^{Alc \ KOH} \ CH_{3}-CH=CH-CH_{2}-CH_{3}$ .
• In the third step, we will add Bromine (Br) to the previous product.
• $CH_{3}-CH=CH-CH_{2}-CH_{3}\rightarrow^{Br_{2}} \ CH_{3}-C(Br)=C(Br)-CH_{2}-CH_{3}$ .
• In the last step, we will add $NaNH_{2}$  to the previous product.
• $CH_{3}-C(Br)=C(Br)-CH_{2}-CH_{3}\rightarrow^{NaNH_{2}} \ CH_{3}-C\equiv C-CH_{2}-CH_{3} .$

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