SINDH MDCAT 2014 PAPER MDCAT 2014 ( PART 5 ) 1. An SN2 reaction at an asymmetric carbon of a compound always gives: A single stereoisomer The same product A product with opposite optical rotation An metamerism of the substrate A mixture of diastereomers 2. In the reaction. R-C = C-R → ? the reagent used to convert alkyne into trans alkene is: Ni Li / NH3 B2H6 / CH3 COOH C6H6 Lindlar catalyst 3. Ethanol. when reacted with PCI5 gave A, POCI3 and HCI. A reacts with AgNO2, to form B and AgCl. A and B are respectively: C2 H6 and C2 H6 NO C2 H6 and C2 H5 OC2 H5 C2 H5 Cl and C2 H5 OC2 H5 C2 H5 Cl and C2 H5 NO2 C2 H6 and C2 H5 NO2 4. The false statement regarding saline hydrides is: They give H2 from H2O They are formed from hydrogen and most electropositive element They are covalent in nature They arc ionic in nature They are used as reducing agents 5. Which of the following compounds is formed when sodium burns in excess of air Na2 O3 Na2 O2 Na2 O NaO2 Loading … Pages: 1 2 3 4 5
