how to make closed chanes of alkanes ,alkynes and alkenes?
how can i made cyclic or heterocylclic chain it is very difficult for me i don;t know about it
Are you just trying the draw the structures or chemically make them? If you had straight chain propane, C3H8 and were making cyclopropane, take 1 hydrogen atom of each end to leave C3H6 and then join the end 2 carbon atoms together. If you had butene C4H8 (either but-1-ene or but-2-ene), again take 1 hydrogen atom of each end to leave C4H6 and then join the end 2 carbon atoms together to give a 4 carbon ring with 1 double bond between 2 of the C atoms.
is a good reference