IUPAC name of $H_{2}NCHO$ is 

Explanation:

The correct IUPAC name of H₂NCHO is Methanamide.

Reasoning:

• H₂NCHO is a simple amide functional group where the -NH₂ group is attached to a carbonyl group (-C=O).
• According to IUPAC nomenclature, amides are named by replacing the "-oic acid" or "-ic acid" of the parent carboxylic acid with "-amide".
• The parent structure here is methanoic acid (formic acid). Replacing the "-oic acid" suffix with "-amide" gives Methanamide.

Why Other Options are Incorrect:

• Amino formaldehyde: Incorrect because it suggests the presence of both an amino group (-NH₂) and an aldehyde (-CHO), which is not the case here.
• Aminomethanal: Incorrect because it refers to an aldehyde (methanal) with an amino group, not an amide.
• Formamide: While Formamide is the common name for H₂NCHO, it is not the IUPAC name.

The correct answer is Methanamide.