1. 45. The correct stability order for the following species is   (II) > (IV) > (I) > (III)   (I) > (II) > (III) > (IV)   (II) > (I) > (IV) > (III)   (I) > (III) > (II) > (IV)   Hint Half-n-half Clue   2. 46. Cellulose upon acetylation with excess acetic anhydride / H2SO4 (catalytic) gives cellulose triacetate whose structure is – (A) (B) (C) (D)   C   D   B   A   Half-n-half Clue   3. 47. In the following reaction sequence, the correct structures of E, F and G are (* implies 13C labelled carbon)   Half-n-half Clue   4. 48. Among the following, the coloured compound is   CuCl   K3[Cu(CN)4]   CuF2   [Cu(CH3CN)4]BF4   Half-n-half Clue   5. 49. Both [Ni(CO)4] and [Ni(CN)4]2– are diamagnetic. The hybridisations of nickel in these complexes, respectively, are   sp3,sp3   sp3,dsp2   dsp2,sp3   dsp2, dsp2   Half-n-half Clue   6. 50. The IUPAC name of [Ni(NH3)4][NiCl4] is   Tetrachloronickel (II) – tetraamminenickel (II)   Tetraamminenickel (II) – tetrachloronickel (II)   Tetraamminenickel (II) – tetrachloronickelate (II)   Tetrachloronickel (II) – tetrachloronickelate (0)   Half-n-half Clue   7. 51. Electrolysis of dilute aqueous NaCl solution was carried out by passing 10 milli ampere current. The time required to liberate 0.01 mol of H2 gas at the cathode is (1 Faraday = 96500 C mol–1)   9.65 × 104 sec   19.3 × 104 sec   28.95 × 104 sec   38.6 × 104 sec   Half-n-half Clue