What is the Lewis structure of the following molecules

What is the Lewis structure of the following molecules? A. CH3NH2 (whose skeletal structure is H3CNH2) B. CH3CO2CH3 (whose skeletal structure is H3CCOOCH3, with both O atoms attached to the second C) C. NH2CO2H (whose skeletal structure is H2NCOOH, with both O atoms attached to C)

The Correct Answer and Explanation is:

Let’s break down the Lewis structures for each molecule.

A. CH3NH2 (Methylamine)

Skeletal structure: H3CNH2

1. Carbon (C) is the central atom, bonded to three hydrogens (H).
2. Nitrogen (N) is bonded to the carbon atom and two hydrogens.
3. The remaining lone pair on nitrogen is placed to complete its octet.

Lewis structure:

• Carbon has 4 bonds (3 single bonds to H and 1 bond to N).
• Nitrogen has 3 bonds (1 to C and 2 to H) and a lone pair.

B. CH3CO2CH3 (Methyl Acetate)

Skeletal structure: H3CCOOCH3

1. The central C is double-bonded to oxygen and single-bonded to the other oxygen.
2. The C is also bonded to 3 hydrogens (making it a methyl group).
3. Each oxygen atom has lone pairs and satisfies the octet rule.

Lewis structure:

• The first carbon is single-bonded to three hydrogens and double-bonded to oxygen (C=O).
• The second oxygen is single-bonded to the carbon and also has lone pairs (C-O).
• The second carbon (attached to the second oxygen) has three hydrogens attached to it.

C. NH2CO2H (Amino Acid Functional Group)

Skeletal structure: H2NCOOH

1. Nitrogen (N) is bonded to two hydrogens.
2. The carbon (C) is doubly bonded to oxygen (C=O) and single-bonded to another OH group.
3. The oxygen atoms have lone pairs.

Lewis structure:

• The nitrogen has 3 bonds (2 with hydrogens and 1 with carbon).
• The carbon has 4 bonds (1 with nitrogen, 1 with OH, and 1 double bond with oxygen).
• Each oxygen has lone pairs to satisfy the octet rule.

Key Points:

1. Each atom in these molecules obeys the octet rule (except hydrogen, which follows the duet rule).
2. Single and double bonds are used to ensure each atom has the appropriate number of electrons.
3. The lone pairs on nitrogen and oxygen atoms complete their octet.