In an addition reaction involving alkenes, what is the product when HBr is added

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Question: In an addition reaction involving alkenes, what is the product when HBr is added to propene?

Options:

Correct Answer: 2-bromopropane

Solution:

The addition of HBr to propene follows Markovnikov\'s rule, leading to the formation of 1-bromopropane.

In an addition reaction involving alkenes, what is the product when HBr is added to propene?

In an addition reaction involving alkenes, what is the product when HBr is added to propene?

Step 1: Identify the alkene. In this case, the alkene is propene, which has the formula C3H6.
Step 2: Understand that HBr is a hydrogen halide that will add across the double bond of the alkene.
Step 3: Apply Markovnikov's rule, which states that when HBr adds to an alkene, the hydrogen (H) will attach to the carbon with the most hydrogen atoms already (the less substituted carbon).
Step 4: In propene, the double bond is between the first and second carbon. The first carbon has 2 hydrogens, and the second carbon has 1 hydrogen.
Step 5: According to Markovnikov's rule, the hydrogen from HBr will attach to the first carbon (C1), and the bromine (Br) will attach to the second carbon (C2).
Step 6: Write the product. The product formed is 1-bromopropane, which has the formula C3H7Br.

Addition Reactions – Addition reactions involve the addition of atoms or groups to a molecule, typically across a double bond.
Markovnikov's Rule – Markovnikov's rule states that in the addition of HX to an alkene, the hydrogen atom will attach to the carbon with the greater number of hydrogen atoms already attached.
Alkenes – Alkenes are hydrocarbons that contain at least one carbon-carbon double bond.