Chemistry - STEREO ISOMERISM Question with Solution | TestHub
Match the Column :
Column I | Column II |
|---|---|
(A) C2-axis of symmetry | (P) |
(B) C3-axis of symmetry | (Q) |
(C) Plane of symmetry | (R) |
(D) Centre of symmetry | (S) |
| (T) |
Options:
Answer:
Solution:
Ans. A P, Q, R, S; B P, Q, T; C P, Q, R, S, T; D P, R.
P (benzene, D6h) has C2, C3 and C6 axes, several planes of symmetry and a centre of symmetry, so it matches A, B, C and D. Q (BF3, D3h) has a C3 principal axis, three C2 axes along the B-F bonds and planes of symmetry, but no centre of symmetry: A, B and C. R (trans-CHCl=CHCl, C2h) has a C2 axis, the molecular plane and a centre of symmetry at the midpoint of C=C: A, C and D. S (CH2Cl2, C2v) has only a C2 axis and two planes of symmetry: A and C. T (NH3, C3v) has a C3 axis and three vertical planes of symmetry but no C2 axis and no centre of symmetry: B and C.
