Among the following, the correct statement concerning the optical activity is:
(a)A molecule containing two or more chiral centres is always optically active.
(b)A molecule containing just one chiral centres is always optically active.
(c)A molecule possessing alternating axis of symmetry is optically active
(d)An optically active molecule should have at least one chiral centre.
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
A single stereocentre always makes a molecule chiral, hence optically active. Two or more centres can give a meso form (a false); an S_n axis makes a molecule achiral (c false); allenes and biphenyls are optically active without any stereocentre (d false).