| Read the assertion and reason carefully to mark the correct option out of the options given below: |
| Assertion: Melting point of n-butane is higher than propane. |
| Reason: It is called oscillation effect. |
A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason both are false.
E) If assertion is false but reason is true.
Correct Answer: B
Solution :
[b] Alkanes with odd carbon atoms have their and carbon atom on the same side of the molecule and in even carbon atom alkane, the end carbon atom on opposite side. Thus alkanes with even carbon atoms are packed closely in crystal lattice to permit greater intermolecular attractions and hence higher melting point.
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