organic chemistry lab questions | Nursing School Essays

Please answer these questions based on the results from my lab experiment. I included my lab info for refrence.
1) Effect of structures – 1°, 2°, and 3° halides (rank 1, 3, and 5 in order of reactivity, then rank 2, 4, and 6 in order of reactivity). Explain observed trends. (4 pts.)
2)Effect of steric hindrance of alkyl halides 1 vs. 8 in SN2 reaction (3 pts)