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Which of the follwing alkanes has the lowest melting point?

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Which of the follwing alkanes has the lowest melting point?
A. `CH_(4)`
B. `CH_(3)CH_(3)`
C. `CH_(3)CH_(2)CH_(3)`
D. `CH_(3)(CH_(2))_(2)CH_(3)`
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Correct Answer - C
Order of melting point:
`underset(-138^(@))(n-"Butane")gtunderset(-172^(@)C)("Ethane")gt underset(-180^(@)C)("Methane")gtunderset(-187^(@)C)("Propane")`
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