Question

1. what makes a molecule an organic compound?

a) it contains carbon and hydrogen
b) it contains only nitrogen
c) it is made of water
d) it has a positive charge

1. which functional group gives molecules acidic properties?

a) hydroxyl (—oh)
b) carboxyl (—cooh)
c) phosphate
d) methyl

Explanation:

For question 4: Organic compounds are defined as compounds that contain carbon and hydrogen. Water (\(H_2O\)) has no carbon, nitrogen - containing compounds without carbon - hydrogen bonds are not organic, and charge has no relation to being organic.
For question 5: The carboxyl group (\(-COOH\)) can donate a proton (\(H^+\)) in solution, which is the characteristic of acidic properties. Hydroxyl (\(-OH\)) can be part of alcohols (not acidic in the same sense as carboxylic acids in organic chemistry context), phosphate (\(-PO_4\)) is related to energy transfer (like in ATP) and has different chemical behavior, and methyl (\(-CH_3\)) is non - reactive in terms of acidity.

Answer:

1. a) It contains carbon and hydrogen
2. b) Carboxyl (—COOH)