Which of the following monomers can undergo free radical, cationic as well as anionic polymerisation with equal ease?

(a) CH3–CCH3=CH2

(b) C6H5–CH=CH2

(c) CH2=CH–CN

(d) CH2=CH2

choose and explain please!!!

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

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how to represent the possible fischer projections for 2-bromohexane