http://rashedsir.com/types-of-aliphatic-hydrocarbons-%e0%a6%85%e0%a7%8d%e0%a6%af%e0%a6%be%e0%a6%b2%e0%a6%bf%e0%a6%ab%e0%a7%87%e0%a6%9f%e0%a6%bf%e0%a6%95-%e0%a6%b9%e0%a6%be%e0%a6%87%e0%a6%a1%e0%a7%8d%e0%a6%b0%e0%a7%8b/