Hydrogen H 1.00794
Carbon C 12.0107
Oxygen O 15.9994
Potassium K 39.0983
I think the correct answer would be B. Octane is a component of fuel used in internal combustion engines. the dominant intermolecular forces in octane are london dispersion forces. Dipole-dipole bonds happens only with polar substances. Hydrogen bonding occurs when H bonds with an O, F or N atom. Covalent bonds are not intermolecular force rather it is an intramolecular force. Carbon-Hydrogen bonds, as far as I know, are not a type of bond, intermolecular or intramolecular. So, we are left with london dispersion force. It is a temporary force that happens when electrons of two atoms in adjacent would occupy positions that would form dipoles temporarily.
Examples of carbohydrates: <span><span>glucose (monosaccharide) and </span><span>fructose (monosaccharide)
Examples of lipids: fats and steroids
Source credit:
</span></span>http://examples.yourdictionary.com/examples-of-lipids.html
https://www.thoughtco.com/examples-of-carbohydrates-603884
K is in the first group can form ion K⁺,
N is in third group can form negative ion (8-5=3) N³⁻