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methylene group

vinyl group

allyl group

The old naming system for alkene C=C bonds was to put the # notation ______ of the parent chain root and suffix, but now it is recommended to put ______ of the suffix.
in front, in front
The common name for ethene is?
Ethylene

The common name for propene is?
Propylene

The common name for 2-methylpropene is?
Isobutylene

The common name for 2-methyl-1,3-butadiene is?
Isoprene
