Assertion:- Tertiary halide give `SN^(1)` reaction.
Reason:- In `SN^(1)` RDS is unimolecular.
Assertion:- Tertiary halide give `SN^(1)` reaction.
Reason:- In `SN^(1)` RDS is unimolecular.
Reason:- In `SN^(1)` RDS is unimolecular.
A
If both Assertion `&` Reason are True `&` the Reason is a correct explanation of the Assertion.
B
If both Assertion `&` Reason are True but Reason is not a correct explanation of the Assertion.
C
If Assertion is True but the Reason is False.
D
If both Assertion `&` Reason are False.
Text Solution
AI Generated Solution
The correct Answer is:
To solve the question regarding the assertion and reason, we will analyze both statements step by step.
### Step 1: Understand the Assertion
The assertion states that "Tertiary halides give SN1 reactions."
- **Explanation**: Tertiary halides (R-CH(X)-R') are known to undergo SN1 reactions due to the stability of the carbocation that forms when the leaving group (X) departs. In the case of tertiary halides, the carbocation formed is tertiary, which is more stable than primary or secondary carbocations because it is stabilized by the surrounding alkyl groups.
**Hint for Step 1**: Recall that the stability of carbocations increases with the number of alkyl groups attached to the positively charged carbon.
### Step 2: Understand the Reason
The reason states that "In SN1, the rate-determining step (RDS) is unimolecular."
- **Explanation**: In an SN1 reaction, the rate-determining step involves the formation of the carbocation, which is a unimolecular process. This means that the rate of the reaction depends solely on the concentration of the substrate (the tertiary halide) and not on the nucleophile (OH⁻ in this case). The reaction proceeds in two steps: first, the leaving group departs to form the carbocation, and then the nucleophile attacks the carbocation.
**Hint for Step 2**: Remember that "unimolecular" indicates that the reaction rate is dependent on one species, which in this case is the tertiary halide.
### Step 3: Analyze the Relationship Between Assertion and Reason
Both the assertion and the reason are true statements. However, we need to determine if the reason correctly explains the assertion.
- **Assertion**: Tertiary halides do indeed undergo SN1 reactions.
- **Reason**: The rate-determining step is unimolecular, which is true, but it does not specifically explain why tertiary halides favor SN1 reactions over other types of reactions.
**Conclusion**: Both statements are true, but the reason does not adequately explain the assertion.
### Final Answer
Both the assertion and the reason are true, but the reason is not the correct explanation for the assertion.
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