Select the organic compounds, whose both melting and boiling points are either positive or negat...

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Select the organic compounds, whose both melting and boiling points are either positive or negative values only.
1. Methane
2. Propanol
3. Ethanol
4. Ethanoic acid
a. 1 and 2
b. 3 only
c. 1 and 4
d. 3 and 4
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