Arrange the following elements in increasing order of electronegativity:
$N, O, F, C, Si$
Choose the correct answer from the options given below:

Which of these has no unit?

The increasing order of electronegativity is:

Assertion : Electron affinity refers to an isolated atom's attraction for an additional electron while electronegativity is the ability of an atom of an element to attract electrons towards itself in a shared pair of electrons.
Reason : Electron affinity is a relative number and electronegativity is experimentally measurable.

The correct order of electronegativities of $N$,$O$,$F$,and $P$ is

Arrange $F$,$Cl$,$O$,and $N$ in the decreasing order of electronegativity.