Home
Class 12
CHEMISTRY
STATEMENT-1: 2-Methyl-2-butene is the ac...

STATEMENT-1: 2-Methyl-2-butene is the acid catalysed dehydration product of neopentyl alcohol.
and
STATEMENT-2: Neopentyl carbocation is the intermediate of the product

A

Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for statement-2

B

Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-2

C

Statement-1 is True, Statement-2 is False

D

Statement-1 is False, Statement-2 is True

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze both statements regarding neopentyl alcohol and its dehydration product. ### Step-by-Step Solution: 1. **Identify Neopentyl Alcohol Structure**: Neopentyl alcohol (2-methyl-2-butanol) has the structure: \[ \text{(CH}_3\text{)}_4\text{C(OH)} \] This structure indicates that the hydroxyl (-OH) group is attached to a carbon that is connected to four other carbons. 2. **Acid-Catalyzed Dehydration**: When neopentyl alcohol undergoes acid-catalyzed dehydration, concentrated sulfuric acid (H₂SO₄) is used. The -OH group will protonate, making it a better leaving group (water). 3. **Formation of Neopentyl Carbocation**: Upon dehydration, the -OH group leaves, forming a neopentyl carbocation, which is a primary carbocation: \[ \text{(CH}_3\text{)}_4\text{C}^+ \] However, primary carbocations are less stable and typically undergo rearrangement. 4. **Rearrangement to More Stable Carbocation**: The neopentyl carbocation can rearrange through a methyl shift to form a more stable tertiary carbocation (2-methyl-2-butyl carbocation): \[ \text{(CH}_3\text{)}_2\text{C}^+\text{(CH}_2\text{)}_2\text{C}^+ \] 5. **Formation of the Alkene**: The tertiary carbocation can lose a proton (H⁺) to form 2-methyl-2-butene: \[ \text{(CH}_3\text{)}_2\text{C}=\text{C(CH}_3\text{)}_2 \] 6. **Evaluate Statements**: - **Statement 1**: "2-Methyl-2-butene is the acid-catalyzed dehydration product of neopentyl alcohol." This is **true**. - **Statement 2**: "Neopentyl carbocation is the intermediate of the product." This is **false** because the intermediate is actually the more stable tertiary carbocation formed after rearrangement. ### Conclusion: - **Statement 1** is true. - **Statement 2** is false. Thus, the answer is that Statement 1 is true and Statement 2 is false.
Promotional Banner

Similar Questions

Explore conceptually related problems

Acid catalysed dehydration of 2-pentanol would give

The major product of acid catalysed dehydration of 2-methylcyclohexanol and butan-1-ol are respectively

Which of the following alkene in acid catalysed hydration form 2- methyl propan -2-ol ?

Predict the major product of acid catalysed dehydration of (i) 1-methylcyclohexanol and (ii) butan-1-ol

Each question contains STATEMENTS-1 (Assertion) and STATEMENT -2 (Reason). Examine the statements carefully and mark the correct answer according to the instructions given below: STATEMENT-1: Product is formed only when the required orientation and energy conditions are met. STATEMENT-2: All collisions between reactants yield the desired product

Statement-1 Hydration of alkenes may give more than one type of alcohol Statement -2 Carbocation intermediate may show rearrangement

The product of reaction of alcoholic- AgNO_(2) with ethyl bromide are

STATEMENT-1: In the acid-base titration involving strong base and weak acid, methyl red can be used as an indicator. STATEMENT-2: Methyl red changes its colour in the pH range 4.2 to 6.3.

Dehydration of alcohol into alkene by concentration H_2SO_4 involves which among the following reaction intermediate ?

The negation of the statement The product of 2 and 3 is 5 " is