Give the structural formula of a saturated and one unsaturated hydrocarbon having general
formula C5 H10
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What are hydrocarbons? Write the name and general formula of (i) saturated hydrocarbons, (ii) unsaturated hydrocarbons and draw the structure of one hydrocarbon of each type. How can an unsaturated hydrocarbon be made saturated?
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1. Hydrocarbons are organic compounds that are made of only hydrogen and carbon atoms.
2. Saturated hydrocarbons have only single bonds between carbon and hydrogen atoms and are called alkanes.
General formula: C
n
H
2n+2
Ethane:- CH
3
−CH
3
3. Unsaturated hydrocarbons have double and triple bonds between carbon atoms. They are alkenes and alkynes.
General formula: alkenes: C
n
H
2nand alkynes: CnH2n−2
Ethene (Alkene):- CH2=CH2
Ethyne (Alkyne):- CH≡CH
4. Unsaturated hydrocarbons can be converted to saturated hydrocarbons by addition of hydrogen which breaks the double or triple bond.
CH
2
=CH
2
+H
2
→
Ni
CH
3
−CH
3