CH2同CH3有咩特性 ?

CH2 is unstable compound, very easy to compose.
CH3 is well known as methyl group, cannot exist independently. It had to 'stick' to the carbons in alkanes or alkenes.

2010-11-26 22:21:49 補充：
CH3 can also be a positive ion called carbenium ion.

wrong question
please ask again