I need help with 1 through 5 please!!

1. How many stereoisomers exist for 2-chloro-3-methylpentane? 2. Which of the following substituents has the highest priority? A. COOH B. CHO C. CH2OH D. CH3 3. Which of the following have the S configuration? ii. iii. A. only I B. only ii C. only lii D. al! E. only i and ii G. only ii and iii 4. Which of the following have the Z configuration? ii. A. only I B. only ii C. only iii D. al! E. only i and if C. only ii and iii 5. Draw cis, (S) - 4-amino 2-octene