When "Alklidene group " is used ? with IUPAC name or with common name

1.	When "Alklidene group " is used ? with IUPAC name or with common name
Answer» Suppose if we have a parent chain and a CH3 group attached to it then we name it as methyl....but when double bond is not taken in parent chain then that CH3 is changed to CH2 then we call it as "methyledene" or" Methylene "...........or if u dont understand so suppose a parent chain started with a double bond and ended with a double bond and also a carbon is combined to it with double bond ( =CH2 with parent chain) . This is an alklidene group we name its member as 1. Methyledene, ethyledene etc.

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