22. One of the space groups for monoclinic crystal system is P2,/c. Here, the 2, symmetry

element corresponds to operation of
(A) Rotation followed by a reflection in a plane
(B) Translation followed by a reflection in a plane parallel 10 the translation axis
(C) Rotation of an axis and translation along that axis
(2) Purely rotational.

23. Which of the following molecules is/are chiral 7
0 cK
+~

پا کم

Me (i) (ii)
(A) Both (iand ii) (8) Only (ii) (C) Only(i) (0) None of them

24. The incorrect feature of R/S-BINAP (2,2'-bis(diphenylphosphino)-1,1'-binaphthyl) from
the following list is
(ಹ) A chiral centre exist
(B) No stereogenic centre
(C) Rotation between two naphthyl rings is restricted.
(D) No chiral centre also no plane of symmetry.

25. Identify the most relevant statement about enantiomers from the following options :
(ಹಿ) They have unidentical physical properties but same biological effects.
(B) They have identical physical properties but quite different biological effects.
(C) They have identical physical and biological properties.
(D) Both physical and biological properties are unidentical.

26. Which one of the following rearrangement has given considerable evidence for involving
cyclopropanone as reaction intermediate ?
(4) Favorskii (8) Pinacol (C) Wolff (2) மேம்பட

27. Among the four Fischer projections given below, identify a compound which is different
from the remaining three ?

CH; NH, NH, Ph
H -|- ۷٢١ ಗಲ --- Ph H3C இ H பல - H
Ph H Ph 018
(i) (ii) (iii) (iv)
(A) (0 (B) Gi) (ಲಿ ൮) (D) (Gv)

28. What is the stereochemical relationship between these two molecules ?

(A) Identical (ए) Enantiomers
(೮) Diastereomers (D) Geometrical isomers.

29. [1 which medium, benzil-benzilic acid rearrangement occurs ?
(^) Basic (B) Slightly acidic (0) Neutral (2) Strongly acidic.

020/2021 ೨೨4 4 454 ۲ 6 .0ರಷ ..ೆಿ A