electronegative substituent造句

例句与造句

1. In general, cyanide is an electronegative substituent.
2. So let's say I have some electronegative substituent, X . So let's have a symmetric molecule X-R2-R1-CH2-R1-R2-X . Would the central carbon be in fact less positive than it would be if it were H3C-R1-R2-X?
3. It's difficult to find electronegative substituent in a sentence. 用electronegative substituent造句挺难的