Ethyl amine reacts with excess of methyl iodide to give

Options

A. ethyl methyl amine
B. ethyl diemthyl amine
C. ethyl trimethyl ammonium iodide
D. All of these

Answer

To solve the question of what products are formed when ethyl amine reacts with excess methyl iodide, we can break down the reaction step by step.

### Step 1: Identify the Reactants
Ethyl amine (C2H5NH2) is a primary amine, and methyl iodide (CH3I) is a methylating agent.

### Step 2: First Reaction
When ethyl amine reacts with methyl iodide, the nitrogen atom in ethyl amine, which has a lone pair of electrons, attacks the carbon atom in methyl iodide. This leads to the formation of a new bond between the nitrogen and the carbon, releasing iodine as iodide ion (I-).

**Reaction:**
\[ C_2H_5NH_2 + CH_3I \rightarrow C_2H_5NH(CH_3) + HI \]

Here, we form **ethyl methyl amine** (C2H5NH(CH3)).

### Step 3: Second Reaction
The newly formed ethyl methyl amine can react again with another molecule of methyl iodide. The nitrogen atom now has a positive charge due to the additional carbon atom bonded to it, making it a more reactive species.

**Reaction:**
\[ C_2H_5NH(CH_3) + CH_3I \rightarrow C_2H_5N(CH_3)_2 + HI \]

This results in the formation of **ethyl dimethyl amine** (C2H5N(CH3)2).

### Step 4: Third Reaction
Continuing with the excess methyl iodide, ethyl dimethyl amine can react with yet another methyl iodide. Again, the nitrogen atom will form a bond with the carbon of methyl iodide, leading to a positively charged nitrogen.

**Reaction:**
\[ C_2H_5N(CH_3)_2 + CH_3I \rightarrow C_2H_5N(CH_3)_3 + HI \]

This results in the formation of **ethyl trimethyl ammonium iodide** (C2H5N(CH3)3I), which is a quaternary ammonium salt.

### Conclusion
The overall products from the reaction of ethyl amine with excess methyl iodide are:
1. Ethyl methyl amine (C2H5NH(CH3))
2. Ethyl dimethyl amine (C2H5N(CH3)2)
3. Ethyl trimethyl ammonium iodide (C2H5N(CH3)3I)

Thus, the correct answer is that ethyl amine reacts with excess methyl iodide to give ethyl methyl amine, ethyl dimethyl amine, and ethyl trimethyl ammonium iodide.