ANS:D - none of these.

The statement "none of these" indicates that none of the provided statements are incorrect; in other words, all of the statements are correct. Let's analyze each statement provided:

1. "Molecules with symmetrical arrangements (e.g., CH4 or CCl4) are nonpolar." This statement is generally true. Molecules with symmetrical arrangements, such as CH4 (methane) or CCl4 (carbon tetrachloride), are typically nonpolar because the individual bond dipoles cancel out due to the symmetric distribution of atoms around the central atom.
2. "Generally, nonpolar compounds are chemically inactive, conduct electricity poorly and do not ionize." This statement is accurate. Nonpolar compounds tend to have low chemical reactivity because they do not readily form bonds with other molecules. Additionally, they do not conduct electricity well because they lack charged particles (ions) or mobile electrons. Lastly, nonpolar compounds do not ionize in solution because they do not dissociate into ions.
3. "Most of the hydrocarbons are nonpolar." This statement is also true. Hydrocarbons consist only of hydrogen and carbon atoms and typically have nonpolar covalent bonds. Therefore, most hydrocarbons, such as alkanes, alkenes, and alkynes, are nonpolar molecules.