Let us evaluate all the statements:

1. Carbon exhibits a strong tendency for catenation, allowing it to form long chains and rings with itself through strong covalent bonds. This statement is correct.
2. Silicon (Si) and Germanium (Ge) are metalloids that are extensively used as semiconductors in the electronics industry. This statement is correct.
3. Boron trifluoride ($BF_3$) is an electron-deficient molecule with an incomplete octet on the boron atom. It readily accepts a lone pair of electrons from donors (like $NH_3$), making it a strong Lewis acid. This statement is correct.
4. Group 14 elements (C, Si, Ge, Sn, Pb) have a general valence shell electronic configuration of $ns^2 np^2$. Thus, their common oxidation states are +2 and +4. The oxidation states of +1 and +3 are characteristic of Group 13 elements. Therefore, this statement is incorrect.