The divalent radical CH3-CH= formally acquired by detatching two hydrogen atoms from same carbon atom of ethane
A bivalent natural radical, CH3CH ⟨. Occasionally known as ethidene.
An unsymmetrical, divalent, hydrocarbon radical, C2H4 metameric with ethylene but written thus, CH3.CH= to tell apart it from the symmetrical ethylene, CH2=CH2. Its compounds derive from aldehyde. Previously labeled as additionally ethidene.