From the list of the isomers given below, select all the structures which are:
(a) achiral compounds(b) enantiomers
(c) diastereomers(d) meso compounds

• A. (a) i, ii, iii and iv.
  (b) v and vi, vii and viii.
  (c) iii and v, iii and vi, iv and vii, iv and viii.
  (d) iii and iv.
• B. (a) v, vi, vii and viii.
  (b) v and vi, vii and viii.
  (c) iii and v, iii and vi, iv and vii, iv and viii.
  (d) i and ii.
• C. (a) i, ii, iii and iv.
  (b.) iii and v, i and vi.
  (c) i and ii.
  (d) ii and iii.
• D. (a) v, vi, vii and viii.
  (b) iii and v, i and vi.
  (c) i and ii.
  (d) i and iv.

Answer: (A)