It is Methene.
It's a methyl group.
2,2,3-tri-methyl-butane is the name of: (CH3)2-CH-C-(CH3)3 or reversely written: (CH3)3-C-CH-(CH3)2
That's Propane. You can also express it as C3H8 .
CH3-CH2-CH3 is a gas Propane.
Butane
The compound CH2=CH-CH=CH2 when reacts with HBr gives 1,4 addition product, CH3-CH=CH-CH2Br
o-diethylbenzene
Ethylbromide is the name of the compound CH3-CH2-Br.
2,2,3-tri-methyl-butane is the name of: (CH3)2-CH-C-(CH3)3 or reversely written: (CH3)3-C-CH-(CH3)2
PENTAN-3-EN-2-ONE
This is hex3-ene-2-ol
Cyclopentyl ethyl ester
butanol
It is 1 fluoropentane.
CH3-CH2-CH2-CH=CH2 will be names as 1-pentene or pent-1-ene
CH3COH(CH3)2; (Ch3) 3COH
The name for the CH3-Ch-CH3 alkyl group is isopropyl.
That's Propane. You can also express it as C3H8 .