The statement is false.
Ethanol, which has the chemical formula C2H5OH, contains two carbon atoms. The first carbon atom (the one connected to the hydroxyl group -OH) is attached to three hydrogen atoms and one hydroxyl group, leading to a tetrahedral arrangement of its four substituents. This arrangement is consistent with the sp3 hybridization of carbon.
However, the second carbon atom is attached to two other carbon atoms (the first carbon and the second carbon in the ethanol chain), meaning it is part of a chain and does not have a tetrahedral structure. This second carbon is also sp3 hybridized, but its geometry is influenced by its bonding with other carbon atoms, contributing to a less clearly tetrahedral arrangement overall due to the linear aspect of the carbon chain.
Therefore, while one of the carbons exhibits tetrahedral geometry, the statement that all carbon environments in ethanol are tetrahedral is not accurate. Hence, the claim is false.