下列化合物与溴发生加成反应活性由高到低排列:( )a.CF____(3)CH=CH____(2) b.CH____(3)CH=CH____(2) C.H____(2)=CH____(2) Aa>b>c Bc>b>a Cb>c>a Dc>a>b

$$ 下列化合物与溴发生加成反应活性由高到低排列:( )a.CF\_\_\__{3}CH=CH\_\_\__{2}\ \ b.CH\_\_\__{3}CH=CH\_\_\__{2}\ \ C.H\_\_\__{2}=CH\_\_\__{2}\ \ Aa>b>c Bc>b>a Cb>c>a Dc>a>b $$