Predict the product(s) that would result when the alkenes shown here are allowed to react under the following conditions: (iv) H₂SO₄ , H₂O
(g)

검증된 단계별 안내

Step 1: Identify the type of reaction. The given reagents, H₂SO₄ (sulfuric acid) and H₂O (water), indicate that the reaction is an acid-catalyzed hydration of an alkene. This reaction adds water (H and OH) across the double bond of the alkene.

Step 2: Determine the regioselectivity of the reaction. Acid-catalyzed hydration follows Markovnikov's rule, meaning the hydrogen (H) will add to the carbon of the double bond that already has more hydrogens, and the hydroxyl group (OH) will add to the carbon with fewer hydrogens.

Step 3: Consider the mechanism. The reaction proceeds via the formation of a carbocation intermediate. The alkene's π electrons attack the proton (H⁺) from H₂SO₄, forming a carbocation at the more stable position (tertiary > secondary > primary).

Step 4: Add the hydroxyl group. Once the carbocation is formed, water (H₂O) acts as a nucleophile and attacks the carbocation, forming an oxonium ion. This intermediate is then deprotonated to yield the final alcohol product.

Step 5: Predict the product structure. Based on the alkene's structure and the application of Markovnikov's rule, draw the product where the OH group is attached to the more substituted carbon of the original double bond, and the H is attached to the less substituted carbon.

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Electrophilic Addition

Electrophilic addition is a fundamental reaction mechanism in organic chemistry where an electrophile reacts with a nucleophile, typically involving alkenes. In the presence of strong acids like H₂SO₄, the alkene's double bond acts as a nucleophile, attacking the electrophilic hydrogen, leading to the formation of a carbocation intermediate. This step is crucial for predicting the products of reactions involving alkenes.

Carbocation Stability

Carbocation stability is a key concept in understanding the outcomes of reactions involving electrophilic addition. Carbocations are positively charged species that can vary in stability based on their structure; tertiary carbocations are more stable than secondary or primary ones due to hyperconjugation and inductive effects. The stability of the carbocation formed during the reaction influences the final product distribution.

Hydration Reaction

The hydration reaction refers to the addition of water (H₂O) to an alkene, resulting in the formation of an alcohol. Under acidic conditions, such as with H₂SO₄, the alkene first forms a carbocation, which then reacts with water to yield the alcohol product. This process is essential for converting alkenes into alcohols and is a common transformation in organic synthesis.

Predict the product(s) that would result when the alkenes shown here are allowed to react under the following conditions: (iv) H2SO4 , H2O (g)