Geometrical Isomerism (Cis-Trans) in trans-2-fluoro-3-methylpent-2-ene

trans-2-fluoro-3-methylpent-2-ene this compound in also known as (Z)2-fluoro-3-methylpent-2-ene. 
I have given my possible structure in the image but it is wrong, Can anyone explain this ?


[![My possible structure](https://i.stack.imgur.com/Nyujr.jpg)](https://i.stack.imgur.com/Nyujr.jpg)




The structure you drew


[![enter image description here](https://i.stack.imgur.com/ZdfKj.png)](https://i.stack.imgur.com/ZdfKj.png)


is ‒ according to the [CIP-rules](https://en.wikipedia.org/wiki/Cahn%E2%80%93Ingold%E2%80%93Prelog_priority_rules) ‒ (*E*)-configured. These rules are applied on *each* side of the double bond; namely


* C of the ethyl group has a higher priority than C of the methyl group
* F has a higher priority than C
* C(ethyl group) opposes F, as seen across the double bond


This is *not* in contradiction that the two methyl groups are opposing each other, are in (*trans*)-relationship with each other.


In instances with only two subsitutents around a double bond, like (*E*)-2-pentene, you may use (*E*), derived from German "entgegen", literally "opposing", as synonym to (*cis*). For the opposite instance, (*Z*), derived from German "zusammen", like "together", to describe a (*trans*)-configuration.


In instances with three or four substitutions around a double bond, and instances of several conjugated double bonds, follow IUPAC and adhere to the (*E*/*Z*) notation; which is absolute and not ‒ as (*cis*/*trans*) ‒ relative and potentially ambiguous. See the example [*E*/*Z* notation](https://en.wikipedia.org/wiki/Cis%E2%80%93trans_isomerism), for example. (Or, as one teacher told me, "stay on the E-Z pass".)


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