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