Question

what is the condition to be satisfied for a compound to be chiral.​

Answer 1

Answer:

For a molecule to be chiral, dissymmetry is the necessary condition. It mean to say that the compound must not possess any of the symmetry ie Plane of symmetry, center of symmetry or alternate axis of symmetry .

Now in the given question there we have to check chiral carbon atom ie C-atom whose all the four valences are satisfied with 4 different groups. Here it should be noted that isotope is considered as different group thus your answer is 3rd option.

Chiral molecules usually contain at least one carbon atom with four nonidentical substituents. Such a carbon atom is called a chiral center (or sometimes a stereogenic center), using organic-speak. Any molecule that contains a chiral center will be chiral (with the exception of a meso compound). For example, the compound shown here contains a carbon atom with four nonidentical substituents; this carbon atom is a chiral center, and the molecule itself is chiral, because it’s nonsuperimposable on its mirror image.

Compounds having chiral carbon are generally optically active i.e., they can bend the plane polarised light