Which molecule has no center of symmetry?

Common point groups

Point group	Symmetry operations	Simple description of typical geometry
C1	E	no symmetry, chiral
Cs	E σh	mirror plane
Ci	E i	inversion center
C∞v	E 2C∞Φ ∞σv	linear

What type of molecular symmetry does a compound have to lack to be chiral?

For a molecule to be chiral, it must lack: Center of inversion i and a plane of symmetry σ.

Can a molecule be Achiral without a plane of symmetry?

Yes, although such examples are very rare. In general, the point groups S2n (n≥2) are where you should look. These molecules have a S2n rotation axis, but no plane of symmetry, and no inversion centre.

Which one does not have a plane of symmetry?

Chiral objects
Chiral objects do not have a plane of symmetry.

Can chiral molecules be symmetrical?

A chiral compound can contain no improper axis of rotation (Sn), which includes planes of symmetry and inversion center. Chiral molecules are always dissymmetric (lacking Sn) but not always asymmetric (lacking all symmetry elements except the trivial identity).

Are molecules that contain a plane of symmetry and chirality centers but are achiral?

The atom which has different groups attached to it is called the chiral center but all the compound having chiral center are not chiral compound, if they possess plane of symmetry, center of symmetry or any other symmetry element, they are achiral compounds.

Which Dimethylcyclobutane does not contain plane of symmetry?

Now, for the isomer $ cis-1,2-dimethyl\;cyclobutane $ , there is no plane of symmetry but its mirror image is similar to original and hence superimposable as shown. Hence, the isomer is achiral and thus not optically active.

Which of the following have plane of symmetry?

Hence the correct answer is option (D) cis-1,2-dimethylcyclohexane has a plane of symmetry.

Which molecule has c3h symmetry?

Boric Acid contains a C3 rotation axis and σh symmetry. Hence it belongs in the C3h point group.