The unsaturated hydrocarbons will react readily with other elements or compounds. true false

The given statement is true.  

The hydrocarbons that comprise double or triple covalent bonds between the adjacent carbon atoms are known as unsaturated hydrocarbons. Those with at least one carbon-to-carbon triple bond are known as alkynes and those with at least one carbon-to-carbon double bonds are known as alkenes.  

Other than aromatic compounds, the unsaturated hydrocarbons undergo addition reactions to their multiple bonds and are very reactive. Thus, unsaturated hydrocarbons will react easily with other elements or compounds.  

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.