Question

identify the correct lewis structure for ch₃cho. select the single best answer.

Explanation:

In the Lewis - structure of $CH_3CHO$ (acetaldehyde), the carbon - carbon bond is single, the carbon - oxygen bond in the carbonyl group is double. The first carbon atom is bonded to three hydrogen atoms and the second carbon atom. The second carbon atom is double - bonded to an oxygen atom and also bonded to a hydrogen atom. The oxygen atom has two lone pairs of electrons. The first structure shows the correct bonding and electron distribution. The second structure has an incorrect triple bond between carbon and oxygen which is not present in acetaldehyde. The third structure is missing a bond to the oxygen atom and has an incorrect electron distribution.

Answer:

The first structure (with the carbon - carbon single bond, carbon - oxygen double bond and appropriate hydrogen atoms and lone pairs on oxygen).