Question

1)How many different hydrocarbons can be obtained by joining two carbon atoms ? Draw their electron dot structures . 
2) Identify the saturated and unsaturated hydrocarbons 
3)How can unsaturated compounds be converted into saturated ones ??

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Answer 1

These are the answers to your questions.

Answer 2

The electron dot diagrams are shown above.

• Three hydrocarbons- one alkane (ethane), one alkene (ethene) and one alkyne (ethyne) can be obtained by joining two carbon atoms.
• Alkanes are saturated hydrocarbons as each carbon forms only single bonds. Alkenes and alkynes have carbons with double and triple bonds respectively. These are unsaturated.
• Unsaturated hydrocarbons are converted to saturated hydrocarbons by hydrogenation or addition of hydrogen.