The IUPAC systematic name for a molecule with a double bond between oxygen and carbon and a single bond between carbon and hydrogen (CH3) is methanal.
The molecule described, with a double bond between oxygen and carbon and a single bond between carbon and hydrogen (CH3), is known as methanal, more commonly referred to as formaldehyde. The systematic naming follows the rules of IUPAC (International Union of Pure and Applied Chemistry) nomenclature. In this compound, the carbon atom is part of an aldehyde functional group, which is characterized by the presence of a double bond between carbon and oxygen.
The IUPAC name for this compound is derived by identifying the longest continuous carbon chain, which, in this case, contains only one carbon atom. Since the aldehyde functional group takes precedence over the alkane structure, the molecule is named as an aldehyde. The systematic name for CH2O is methanal, where "meth-" denotes the one-carbon alkane chain, and "-al" signifies the aldehyde functional group.
In summary, the systematic name for a molecule with a double bond between oxygen and carbon and a single bond between carbon and hydrogen (CH3) is methanal, according to IUPAC nomenclature.
The question probable may be:
What is the systematic name for a molecule with a double bond between oxygen and carbon, and a single bond between carbon and hydrogen (CH3)?