Write structural formulas for the following compounds (includes both old- and new-style names).
(a) 2-octyne
(b) ethylisopentylacetylene
(c) ethynylbenzene
(d) cyclohexylacetylene
(e) 5-methyl-3-octyne
(f) trans-3,5-dibromocyclodecyne
(g) 5,5-dibromo-4-phenylcyclooct-1-yne
(h) (E)-6-ethyloct-2-en-4-yne
(i) 1,4-heptadiyne
(j) vinylacetylene
(k) (S)-3-methyl-1-penten-4-yne