Doubts about IUPAC nomenclature of 4-ethyl-1-fluoro-2-nitrobenzene

Why is 4-ethyl-1-fluoro-2-nitrobenzene (structure is in the attached picture) called so ?


Shouldn't it be called as 1-ethyl-4-fluoro-3-nitrobenzene since the *precedence of ethyl is greater than halogens*?


![4-ethyl-1-fluoro-2-nitrobenzene](https://i.stack.imgur.com/QsRCVm.png)




The current version of *[Nomenclature of Organic Chemistry – IUPAC Recommendations and Preferred Names 2013 (Blue Book)](http://dx.doi.org/10.1039/9781849733069-fp001)* reads as follows:



> 
> **P-14.4** NUMBERING
> 
> 
> When several structural features appear in cyclic and acyclic compounds, low locants are assigned to them in the following decreasing order of seniority:
> 
> 
> (…)
> 
> 
> (f) detachable alphabetized prefixes, all considered together in a series of increasing numerical order;
> 
> 
> (g) lowest locants for the substituent cited first as a prefix in the name;
> 
> 
> (…)
> 
> 
> 


Note that Rule f takes precedence over Rule g. Also note that all prefixes (i.e. ethyl, fluoro, and nitro) are considered together; i.e., there isn’t any order of functional group priorities at this point.


Furthermore,



> 
> **P-14.3.5** Lowest set of locants
> 
> 
> The lowest set of locants is defined as the set that, when compared term by term with
> other locant sets, each cited in order of increasing value, has the lowest term at the first
> point of difference; (…)
> 
> 
> 


Therefore, the example is named as **4-ethyl-1-fluoro-2-nitrobenzene** rather than 1-ethyl-4-fluoro-3-nitrobenzene since the locant set ‘1,2,4’ is lower than ‘1,3,4’.


![4-ethyl-1-fluoro-2-nitrobenzene](https://i.stack.imgur.com/kIFaz.png)
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