Challenges in 3rd september 2020 2nd shift

which questions have been challenged from 3rd september 2nd shift??

i could find 2 numerical range issues in chemistry.

I challenged the tert butyl one, the one with sn2 reactivity order and that ortho para one with h bonding.
A friend of mine challenged one from physics shm where new amplitude was given sqrt(2) instead of sqrt(1/2).

According to you what should be the answer of tertbutyl one?

double bond at less substituted side via E2

any more?

Only one corrected