A molecule that contains two chiral carbon atoms may NOT be optically active? True or False?

Can someone explain it to me also?A molecule that contains two chiral carbon atoms may NOT be optically active? True or False?
True.





In most cases, two chiral carbon atoms would make a compound optically active. The only case where it is not optically active is in a meso compound.





In a meso compound, there is a plane of symmetry between the two chiral carbons. Essentially, one chiral carbon is a perfect mirror image of the other chiral carbon. This is why the compound is not optically active. One of the chiral carbons is bending the plane-polarized light X degrees in the positive direction. The other chiral carbon is a perfect mirror image, so it is bending the light X degrees in the negative (opposite) direction. The two chiral carbons then cancel each other out and the optical rotation is zero.