Question

which molecules show an appropriate number of bonds around each carbon atom? select the three that apply.

Explanation:

Step1: Recall carbon - bonding rule

Carbon has a valence of 4, meaning it forms 4 bonds.

Step2: Analyze first structure

In the first structure (a simple alcohol), each carbon has 4 bonds (either C - H or C - C or C - O), so it is correct.

Step3: Analyze second structure

In the second structure (a carboxylic - like structure), each carbon has 4 bonds (C - H, C - C, C - O single or double bonds), so it is correct.

Step4: Analyze third structure

In the third structure (a heterocyclic compound), each carbon has 4 bonds (C - H, C - N, C - C double or single bonds), so it is correct.

Step5: Analyze fourth structure

In the fourth structure, the carbon bonded to nitrogen and oxygen has 3 bonds (C - N, C - O, C - C), which is incorrect as carbon should have 4 bonds.

Step6: Analyze fifth structure

In the fifth structure, each carbon has 4 bonds (C - H, C - C single or double bonds), so it is correct.

Answer:

The first, second, and fifth structures.