C2H6O Ethanol

Two-State Hamiltonian based on the fixed framework axis method (FFAM) 

Quantum State Molecular Constants Reference Method 

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In step 3 we set out a partial structure that shows the order in which the atoms are connected. This is called the connectivity of the molecule and is almost always determined by experiment. Most of the time carbon has four bonds, nitrogen has three, and oxygen two. It frequently happens in organic chemistry that two or more different compounds have the same molecular formula, but different connectivities. Ethanol and dimethyl ether—the examples shown in the table—are different compounds with different properties, yet have the same molecular formula (C2H6O). Ethanol is a liquid with a boiling point of 78°C. Dimethyl ether is a gas at room temperature its boiling point is — 24°C. 

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