MOLECULAR POLARITYFIELD NOTE 21 / 175

Is C2H5Cl polar or nonpolar?

C2H5Cl is polar because the C–Cl bond distinguishes one end of the ethane framework.

THE ANSWERPolar.

Chloroethane · tetrahedral at each C

FIGURE 01

The molecule in space

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STRUCTURE / 01
Cl ×1C ×2H ×5
HHClCCHHH
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01 / MODEL RECORDPubChem 3D coordinates. Atom sizes and bond thickness are illustrative.How model data is used ↗

THE REASONING

Why C2H5Cl is polar

The two carbons are locally tetrahedral, but one terminal H of ethane is replaced by chlorine. The polar C–Cl bond creates a charge imbalance that the hydrocarbon bonds do not cancel.

A USEFUL DISTINCTION

What to notice

Ethane is nearly symmetric and nonpolar; chloroethane is not. One different terminal atom can change the molecular dipole without changing carbon's local shape.

QUICK REFERENCE

Common questions about C2H5Cl

  1. 01
    What does the Lewis structure of C2H5Cl show?

    The connectivity is CH3–CH2–Cl. Both carbons make four single bonds; chlorine keeps three lone pairs.

  2. 02
    What is the molecular geometry of C2H5Cl?

    C2H5Cl has a tetrahedral at each C molecular geometry. The 3D model shows representative bond angles of 110.5° and 108° and 110.8°. These angles come from the displayed model coordinates.

  3. 03
    What is the molar mass of C2H5Cl?

    C2H5Cl has an approximate molar mass of 64.51 g/mol, calculated from its formula using abridged standard atomic weights. Natural isotope variation can change the last digits.

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