1.
The number of possible enantiomeric pair(s) produced from the bromination of I and II, respectively, are

I: (H3C)2C=C(CH3)2(\text{H}_3\text{C})_2\text{C}=\text{C}(\text{CH}_3)_2
II: (H3C)2C=CH2(\text{H}_3\text{C})_2\text{C}=\text{CH}_2