MOLECULAR POLARITYFIELD NOTE 55 / 175

Is C7H6O polar or nonpolar?

Benzaldehyde (C7H6O) is polar because its terminal aldehyde C=O bond makes one side oxygen rich.

THE ANSWERPolar.

Benzaldehyde · planar aldehyde C adjoining phenyl ring

FIGURE 01

The molecule in space

Drag to turn the molecule. Show angles to read the model geometry.

STRUCTURE / 01
O ×1C ×7H ×6
HCCHHCCCCHHCHO
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01 / MODEL RECORDPubChem 3D coordinates. Atom sizes and bond thickness are illustrative.How model data is used ↗

THE REASONING

Why C7H6O is polar

Benzaldehyde consists of a benzene ring attached to –CHO. The aromatic ring is comparatively hydrocarbon-like, while the terminal carbonyl creates a pronounced molecular dipole.

A USEFUL DISTINCTION

What to notice

Benzaldehyde and acetophenone both contain a phenyl ring and carbonyl; the former is an aldehyde with H on the carbonyl carbon.

QUICK REFERENCE

Common questions about C7H6O

  1. 01
    What does the Lewis structure of C7H6O show?

    The connectivity is C6H5–C(=O)H. The ring is aromatic and the aldehyde oxygen has two lone pairs.

  2. 02
    What is the molecular geometry of C7H6O?

    C7H6O has a planar aldehyde C adjoining phenyl ring molecular geometry. The 3D model shows representative bond angles of 120° and 120.9°. These angles come from the displayed model coordinates.

  3. 03
    What is the molar mass of C7H6O?

    C7H6O has an approximate molar mass of 106.12 g/mol, calculated from its formula using abridged standard atomic weights. Natural isotope variation can change the last digits.

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