Draw the alkene formed when 1-heptyne is treated with one equivalent of HBr.
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Question “Draw the alkene formed when 1-heptyne is treated with one equivalent of HBr.”
Draw the alkene formed when 1-heptyne is treated with one equivalent of HBr.
Answer
Alkyne and hydrogen halide are combined to make an alkenyl-halide product. This reaction is a continuation of Markovnikov’s addition pathway.
Markovnikov’s addition: Markovnikov’s addition of hydrogen to alkyne creates the most stable alkene.
![HBr
R-](https://drive.google.com/uc?id=1dLCkY_oNa8XXTGgs2wcAk1FeIyhthj5d&export=download/Draw-the-alkene-formed-when-1-heptyne-is-treated-with-one-equivalent-of-HBr..png?x-oss-process=image/resize,w_560/format,webp)
Markovnikov’s rule states that hydrogen halide with a negatively charged addendum is linked to carbon atoms.
Below is an illustration of the alkyne structure.
![Н.
hept-1-yne](https://drive.google.com/uc?id=1YxPiGfdCCoYuU12p7x7_TFTXqTo4oPhV&export=download/Draw-the-alkene-formed-when-1-heptyne-is-treated-with-one-equivalent-of-HBr..png?x-oss-process=image/resize,w_560/format,webp)
![](https://drive.google.com/uc?id=1CHL2o8sq03xErnAWbpTx6JhrI3aYnx9v&export=download/Draw-the-alkene-formed-when-1-heptyne-is-treated-with-one-equivalent-of-HBr..png?x-oss-process=image/resize,w_560/format,webp)
reaction to the Hept-1-yne shown below.
![Br-
H
alkenyl cation](https://drive.google.com/uc?id=1QtuNRL5BJWhescgEMonOFBke5ryIR2xD&export=download/Draw-the-alkene-formed-when-1-heptyne-is-treated-with-one-equivalent-of-HBr..png?x-oss-process=image/resize,w_560/format,webp)
In this addition reaction, nucleophile is
![](https://drive.google.com/uc?id=1QQnJZrEa5_UOqcOmzBqMMG2Jqh-ALbkk&export=download/Draw-the-alkene-formed-when-1-heptyne-is-treated-with-one-equivalent-of-HBr..png?x-oss-process=image/resize,w_560/format,webp)
(bromide ion).
Below is a nucleophilic attack against the intermediate
![HT
2-bromohept-1-ene](https://drive.google.com/uc?id=1PLvNS3kzpzA9rMbLjqmkvObtgEt9ADqe&export=download/Draw-the-alkene-formed-when-1-heptyne-is-treated-with-one-equivalent-of-HBr..png?x-oss-process=image/resize,w_560/format,webp)
The general reaction is as follows.
![HBr
(1 equiv)
hept-1-yne
2-bromohept-1-ene](https://drive.google.com/uc?id=1UKWtIvd70HZZj0IU0yWshkWm8PIwAe_7&export=download/Draw-the-alkene-formed-when-1-heptyne-is-treated-with-one-equivalent-of-HBr..png?x-oss-process=image/resize,w_560/format,webp)
Ans:
Below is A picture of the alkene produced during the addition reaction.
![2-bromohept-1-ene](https://drive.google.com/uc?id=1dIsxdvSOleOX8Dv-7DtIpKek6jvfz6h0&export=download/Draw-the-alkene-formed-when-1-heptyne-is-treated-with-one-equivalent-of-HBr..png?x-oss-process=image/resize,w_560/format,webp)
Conclusion
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