Give the electron dot structure and structural formula of first member of alkene and alkyne familes.

Explanation

(i) `underset("Ethane")(H:overset(H)overset(..)(C): :overset(H)overset(..)(C):H" or "H-overset(H)overset(|)(C)=overset(H)overset(|)(C)-H`
(ii) `underset("Ethyne")(H:C: : : C:H" or "H-C-=C-H`.