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 Triple-bonded straight-chain hydrocarbon molecules (alkynes) is named using the
suffix -"yne."

Saturated hydrocarbon Unsaturated hydrocarbon
Alkanes, Alkenes, Alkynes
C-C single bonds C=C double bonds C≡C triple bonds
General Formula-CnH2n+2 General Formula-CnH2n General Formula-CnH2n-2

Named using Suffix- “-ane” Named using Suffix- “-ene” Named using Suffix- “-yne”
Chemically least reactive Chemically more reactive Chemically most reactive
compounds due to presence compounds due to presence compounds due to
of C-C single bonds. of C=C double bonds. presence of C≡C triple
bonds.
Examples- Examples- Examples-
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1. CH4- Methane . C2H4- Ethene . C2H2- Ethyne
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2
2. C2H6- Ethane 2. C3H6- Propene . C3H4- Propyne
3
.
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3. C3H8- Propane C4H8- Butene . C4H6- Butyne
4
.
4. C4H10- Butane C5H10- Pentene H8- Pentyne
.
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C5
5. C5H12- Pentane 5. C6H12- Hexene 5. C6H10- Hexyne

 Alkyl Group-
An Alkyl group is an Alkane with one HYDROGEN atom less.

ALKANE - H → ALKYL GROUP

GF- CnH2n+2 - H → -CnH2n+1

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