4. Which of the following would you expect to be effective chelating agents? A) CH3CH2OH D)CH3(CH2)3 – NH2 O O B) HO – C – CH2 – C – OH E) none of the given C) PH3

To determine which of the given compounds would be effective chelating agents, we need to understand what chelating agents are. Chelating agents are molecules that have multiple donor atoms capable of forming coordinate bonds with a metal ion. These donor atoms typically include oxygen, nitrogen, or sulfur.

Let's analyze each compound:

A) CH3CH2OH: This compound is ethanol, which contains only carbon, hydrogen, and oxygen atoms. It does not have any donor atoms capable of forming coordinate bonds with a metal ion. Therefore, it is not an effective chelating agent.

B) HO – C – CH2 – C – OH: This compound is ethylenediaminetetraacetic acid (EDTA), which is a well-known chelating agent. It contains multiple oxygen and nitrogen atoms that can form coordinate bonds with metal ions. Therefore, it is an effective chelating agent.

C) PH3: This compound is phosphine, which contains only phosphorus and hydrogen atoms. It does not have any donor atoms capable of forming coordinate bonds with a metal ion. Therefore, it is not an effective chelating agent.

D) CH3(CH2)3 – NH2: This compound is butylamine, which contains carbon, hydrogen, and nitrogen atoms. The nitrogen atom can act as a donor atom and form coordinate bonds with a metal ion. Therefore, it is a potential chelating agent.

E) None of the given compounds: This option implies that none of the compounds listed are effective chelating agents. However, as we have determined, compound B (HO – C – CH2 – C – OH) is indeed an effective chelating agent.

In conclusion, the expected effective chelating agents among the given compounds are B) HO – C – CH2 – C – OH and D) CH3(CH2)3 – NH2.