**IUPAC Name of CH3CH2NHCHO**

The IUPAC name of the compound CH3CH2NHCHO can be determined by following the rules and guidelines set by the International Union of Pure and Applied Chemistry (IUPAC). Let's break down the IUPAC name of this compound step by step.

**Step 1: Identify the Longest Continuous Carbon Chain**

In the given compound, CH3CH2NHCHO, we have three carbon atoms linked together in a straight chain. This chain consists of two carbon atoms connected by a single bond (ethyl group). Therefore, the longest continuous carbon chain in this compound is two carbons long.

**Step 2: Identify and Name Substituents**

The remaining atoms or groups attached to the main carbon chain are called substituents. In this compound, we have two substituents: an amino group (NH2) attached to the second carbon atom and a carbonyl group (CHO) attached to the first carbon atom.

**Step 3: Numbering the Carbon Chain**

The carbon chain is numbered from the end that gives the substituents the lowest possible numbers. In this case, we can number the chain from either end, but to keep the amino group at the lowest possible number, we start numbering from the end closest to the amino group.

**Step 4: Name the Substituents Using Prefixes**

The amino group (NH2) is named as an amino substituent. Since it is attached to the second carbon atom, it is called N-ethyl.

The carbonyl group (CHO) is named as a formyl substituent. Since it is attached to the first carbon atom, it is called N-formyl.

**Step 5: Combine the Names**

To combine the names of the substituents and the carbon chain, we use hyphens (-) to separate the substituent names and commas (,) to separate the numbers. In this case, the IUPAC name of CH3CH2NHCHO is:

**N-ethyl-N-formyl ethanamine**

**In summary, the IUPAC name of CH3CH2NHCHO is N-ethyl-N-formyl ethanamine.**

N ethyl methanamide