For the following compounds, write structural formulas and IUPAC names for all possible isomers having the number of double or triple bond as indicated:
(a) `C_(4)H_(8)`(one double bond)
(b) `C_(5)H_(8)` (one triple bond)

Explanation

(a) (i) `CH_(2) = CH- CH_(2)- CH_(3) " "` But-1-ene

(iv) `CH_(2)= underset(CH_(3))underset(|)C-CH_(3)" "` 2-Methylprpaene
(b) (i) `HC -= C- CH_(2)- CH_(2)-CH_(3)" "` Pent-1-yne
(ii) `CH_(3)- C -= CH- CH_2- CH_3" "` Pent-2-yne
(iii) `CH_(3)- underset(CH_(3))underset(|)CH-C -= CH " " ` 3-Methylbut-1-yne