Yes, a molecule without a chiral center can still be chiral if it has a chiral axis or plane of symmetry. Molecules with a chiral axis or plane of symmetry can exhibit chirality even without a chiral center. This type of chirality is known as axial chirality or planar chirality, and it arises from the arrangement of substituents around an axis or within a plane in a way that prevents the molecule from being superimposable on its mirror image. **

Chiral refers to a molecule that is not superimposable on its mirror image. This means that chiral molecules have a non-superimposable mirror image, similar to how our left and right hands are not identical. Chirality is an important concept in chemistry and biology, as chiral molecules can have different properties and interactions with other molecules. **

To determine if a compound is chiral, we need to examine its molecular structure and look for the presence of a chiral center. A chiral center is a carbon atom bonded to four different groups. If the compound contains at least one chiral center, then it is chiral. However, if the compound lacks a chiral center or has a plane of symmetry, then it is achiral. Therefore, the chiral nature of a compound depends on its specific molecular structure. **

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Glucose is of chiral nature because it contains a carbon atom that is bonded to four different groups, resulting in a non-superimposable mirror image called an enantiomer. This carbon atom is known as a chiral center, and its presence in glucose gives rise to its chiral nature. As a result, glucose exists in two enantiomeric forms, known as D-glucose and L-glucose, which have the same chemical formula but differ in their spatial arrangement of atoms. **

No, the angular distribution of a chiral gas could not be achiral with a similarly chiral structured surface. The chirality of the gas molecules and the surface structure would interact in a way that preserves the overall chirality of the system. Chirality is a fundamental property that cannot be canceled out by a similarly chiral structure, so the angular distribution of the chiral gas would still exhibit chirality when interacting with a chiral structured surface. **

Benzene does not have any chiral centers because it is a symmetrical molecule. Chiral centers are carbon atoms that are bonded to four different groups, causing them to be non-superimposable mirror images. Since benzene's structure is planar and symmetrical, it does not have any chiral centers. **

Glucose has four chiral centers because it is a six-carbon molecule with an asymmetric carbon atom at each of these positions. This means that each of these carbon atoms is bonded to four different groups, resulting in the potential for each of them to have two different spatial arrangements, or enantiomers. These chiral centers give glucose its ability to exist in multiple stereoisomeric forms, such as D-glucose and L-glucose, which have different biological properties. **