Question

Observe and write the answers to the questions given below:

I. \[\begin{array}{cc} \ce{H}\phantom{...}\ce{H}\\ |\phantom{....}|\\ \ce{H - C - C - H}\\ |\phantom{....}|\\ \ce{H}\phantom{...}\ce{H}\\ \end{array}\]

II. \[\begin{array}{cc} \ce{H}\phantom{.........}\ce{H}\\ \backslash\phantom{.......}/\\ \ce{\phantom{.}C \phantom{.}= \phantom{.} C\phantom{.}}\phantom{.}\\ /\phantom{.......}\backslash\\ \ce{H}\phantom{.........}\ce{H}\\ \end{array}\]

1. Write the names of compound I and II.
2. Draw electronic-dot structure for I and II.
3. Which one of the above structures is saturated compound and unsaturated compound?

Answer 1

a.

• Name of compound I: Ethane 
• Name of compound II: Ethene or ethylene

b. Electron dot structure of:

I. \[\begin{array}{cc}
\ce{H}\phantom{...}\ce{H}\\
\ce{H}\phantom{.}\ce{\text{}^\bullet_\bullet}\phantom{.}\ce{\overset{\bullet\bullet}{\underset{\bullet\bullet}{C}}}\phantom{.}\ce{\text{}^\bullet_\bullet}\phantom{.}\ce{\overset{\bullet\bullet}{\underset{\bullet\bullet}{C}}}\phantom{.}\ce{\text{}^\bullet_\bullet}\phantom{.}\ce{H}\\
\ce{H}\phantom{...}\ce{H}\\
\end{array}\]

II. \[\begin{array}{cc} \ce{H}\phantom{....}\ce{H}\phantom{..}\\ \ce{\overset{\bullet\bullet}{\underset{\bullet\bullet}{C}}}\phantom{.}\ce{\text{}^\bullet_\bullet} \phantom{.}\ce{\text{}^\bullet_\bullet}\phantom{.}\ce{\overset{\bullet\bullet}{\underset{\bullet\bullet}{C}}}\phantom{..}\\ \ce{H}\phantom{....}\ce{H}\phantom{..}\\ \end{array}\]

c.

• Compound I i.e. Ethane is saturated hydrocarbon
• Compound II i.e. Ethene, is an unsaturated hydrocarbon.