Alkanamines have the general formula -

Options

A. `C_(n)H_(2n-1)N`
B. `C_(n)H_(2n+3)N`
C. `C_(n)H_(2n+1)N`
D. `C_(n)H_(2n-3)N`

Answer

To determine the general formula for alkanamines, we can follow these steps:

### Step 1: Understand the Components
Alkanamines are derived from alkanes by replacing one hydrogen atom with an amine group (NH2).

### Step 2: Write the General Formula for Alkanes
The general formula for alkanes is given by:
\[ C_nH_{2n+2} \]
where \( n \) is the number of carbon atoms.

### Step 3: Replace One Hydrogen with the Amine Group
When we replace one hydrogen atom in the alkane with the amine group (NH2), we need to adjust the formula:
- Start with the alkane formula: \( C_nH_{2n+2} \)
- Remove one hydrogen (H) and add the amine group (NH2):
\[ C_nH_{2n+2} - H + NH_2 \]
This simplifies to:
\[ C_nH_{2n+1}NH_2 \]

### Step 4: Combine the Hydrogen Atoms
Now, we can combine the hydrogen atoms:
- The formula now has \( 2n + 1 \) hydrogen atoms from the alkane and 2 from the amine group:
\[ H_{2n+1} + H_2 = H_{2n+3} \]

### Step 5: Write the Final General Formula
Thus, the general formula for alkanamines becomes:
\[ C_nH_{2n+3} \]

### Conclusion
The general formula for alkanamines is:
\[ C_nH_{2n+3} \]