Methyl carbanion is................and...............with ammonia.

Answer

To answer the question "Methyl carbanion is................and...............with ammonia," we need to analyze the properties of methyl carbanion (CH3⁻) and ammonia (NH3).

### Step-by-Step Solution:

1. **Identify the Structure of Methyl Carbanion (CH3⁻)**:
- Methyl carbanion has the formula CH3⁻. It consists of one carbon atom bonded to three hydrogen atoms and carries a negative charge.
- The carbon atom has 4 valence electrons, and with the addition of one extra electron (due to the negative charge), it has a total of 5 electrons.

2. **Identify the Structure of Ammonia (NH3)**:
- Ammonia has the formula NH3. It consists of one nitrogen atom bonded to three hydrogen atoms.
- Nitrogen has 5 valence electrons, and with 3 hydrogen atoms (each contributing 1 electron), it has a total of 8 electrons.

3. **Compare the Electron Count**:
- Methyl carbanion (CH3⁻) has 10 electrons (4 from carbon and 6 from hydrogen).
- Ammonia (NH3) has 10 electrons (5 from nitrogen and 5 from hydrogen).
- Since both species have the same number of electrons, they are **iso-electronic**.

4. **Compare the Geometry**:
- The geometry of methyl carbanion is tetrahedral due to the four electron pairs (three bonding pairs and one lone pair).
- Ammonia also has a tetrahedral shape but is often described as having a trigonal pyramidal geometry due to the presence of a lone pair on nitrogen.
- Therefore, methyl carbanion and ammonia are **iso-structural** as well.

5. **Final Answer**:
- Methyl carbanion is **iso-electronic** and **iso-structural** with ammonia.