Given below are two statements:
| Assertion (A): | Among isomeric pentanes, 2,2-dimethylpropane has the highest boiling point. |
| Reason (R): | Branching does not affect the boiling point. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | Both (A) and (R) are false. |
| 4. | (A) is true but (R) is false. |
Hint: Boiling point is inversely proportional to branching
As branching increases, the boiling point of alkane decreases in comparable molecular masses. The structures of pentane and 2,2-dimethylpropane are as follows:
As branching increases the boiling point of the compound decreases but in compounds with comparable molar masses. Hence, 2,2-dimethylpropane boiling point is lower than pentane because it has a higher branching than pentane.
Thus, both assertion and reason are not correct.
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