The accuracy of ab initio calculations of molecular properties compared to experimentally determined data can vary significantly depending on several factors, such as the level of theory used, the basis set, and the size and complexity of the molecule being studied.Ab initio calculations are based on quantum mechanics and involve solving the Schrödinger equation for a given molecular system. These calculations are performed using various approximations and computational methods, which can be classified into different levels of theory. Higher levels of theory generally provide more accurate results but are also more computationally demanding.The basis set used in ab initio calculations also plays a crucial role in determining the accuracy of the results. A basis set is a mathematical representation of the atomic orbitals in a molecule. Larger and more complete basis sets provide more accurate results but require more computational resources.In general, ab initio calculations can provide very accurate results for small molecules and simple systems, often in good agreement with experimental data. However, as the size and complexity of the molecule increase, the accuracy of ab initio calculations can decrease due to the limitations of the approximations and the computational methods used.Moreover, experimental data can also have uncertainties and errors, which can affect the comparison between ab initio calculations and experimental results. It is essential to consider these uncertainties when comparing the two types of data.In summary, the accuracy of ab initio calculations of molecular properties compared to experimentally determined data depends on the level of theory, the basis set, and the size and complexity of the molecule. While ab initio calculations can provide accurate results for small molecules and simple systems, their accuracy can decrease for larger and more complex molecules. Comparing ab initio calculations with experimental data should take into account the uncertainties and errors associated with both types of data.