Verified Answer :

Giangiglia

Explanation:

The reaction with HBr is a nucleofilic adition with the following steps:

  • Step 1: Carbocation formation
  • Step 2: Product formation (addition of Br-)

In the first step, the more sustituted the carbocation is the more stable. Meaning this that the most stable will be a terciary C (such as in ter buthene), the  less stable the primary C (ethene for example) and between them, the secondary C (propene).

Analizing that and knowing that this mechanism of reaction follows the rule of Markovnikov, you can determine the reaction speed of an alkene.

Also the more resonance intermediates it has, the slower the reacrion is.

The alkene which reacts fastest with the HBr for the formation of product is substituted and tertiary alkene.

What is nucleophilic addition reaction?

Nucleophilic addition reactions are those reactions in which nucleophile adds on the double bond of the alkene.

  • Addition of HBr to the double bond of alkene takes place through the formation of carbocation, followed by the markonikoff rule for the formation of product.
  • More stable carbocation will react fastly and form the product.
  • So, tertiary alkene will reacts fastest with HBr as they will form tertiary carbocation which is stable in nature.

Hence tertiary alkene will reacts fast.

To know more about carbocation, visit the below link:

https://brainly.com/question/14363695

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