27. For the mass spectrum of compound Y, we found 3 lines in the molecular ion region (M+
, M+
+2, M+
+4), shows the peak
heights in the ratio of 9 : 6 : 1. What would the compound Y be?
(A) cis-1,2-Dichlorocyclohexane (B) 2-Chloropentane (C) cis-1,2-Dibromocyclohexane
(D) Bromobenzene (E) 1,2-Dibromopentane.
44. For the reaction shown below, the resulting stereochemistry of the expected product is best described as:
(A) (R, E) (B) (S, E) (C) (R, Z) (D) (S, Z) (E) only (S).