MOLECULAR POLARITYFIELD NOTE 37 / 175

Is Diethyl Ether (C4H10O) polar or nonpolar?

Diethyl Ether (C4H10O) is polar because the two C–O bonds meet at an angle and leave an oxygen-centered dipole.

THE ANSWERPolar.

Diethyl Ether · bent at O; tetrahedral at C

FIGURE 01

The molecule in space

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STRUCTURE / 01
O ×1C ×4H ×10
HHHHOCCCCHHHHHH
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01 / MODEL RECORDPubChem 3D coordinates. Atom sizes and bond thickness are illustrative.How model data is used ↗

THE REASONING

Why C4H10O is polar

Diethyl ether has oxygen between two ethyl groups. Oxygen has two lone pairs, making the C–O–C unit bent; the two bond dipoles reinforce rather than cancel completely.

A USEFUL DISTINCTION

What to notice

An ether has C–O–C but no O–H bond. Diethyl ether is polar, yet it cannot donate a hydrogen bond as an alcohol can.

QUICK REFERENCE

Common questions about Diethyl Ether (C4H10O)

  1. 01
    What does the Lewis structure of Diethyl Ether (C4H10O) show?

    The connectivity is CH3CH2–O–CH2CH3. Oxygen has two single bonds and two lone pairs.

  2. 02
    What is the molecular geometry of Diethyl Ether (C4H10O)?

    Diethyl Ether (C4H10O) has a bent at O; tetrahedral at C molecular geometry. The 3D model shows representative bond angles of 111.6° and 109° and 109.8°. These angles come from the displayed model coordinates.

  3. 03
    What is the molar mass of Diethyl Ether (C4H10O)?

    C4H10O has an approximate molar mass of 74.12 g/mol, calculated from its formula using abridged standard atomic weights. Natural isotope variation can change the last digits.

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