What are the names of the compounds shown below?
i. ii.

i. 4,4-dimethylhex-2-yne

ii. 3-bromobut-1-yne

i. 4,4-dimethylhex-3-yne

ii. 3-bromobut-2-yne

i. 3,3-dimethylhex-2-yne

ii. 2-bromobut-1-yne

i. 3,3-dimethylhex-4-yne

ii. 2-bromobut-2-yne