Question
Write the structure of A, B, C, D and E in the following reactions:
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(i) Diethyl ether
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  1. What may be the possible oxidation states of the transition metals with the following d electronic configurations in the ground state of their atoms:
  1. $3d^34s^2, 3d^54s^2$ and $3d^6 4s^3$. Indicate relative stability of oxidation states in each case.
  2. Write steps involved in the preparation of $(i) Na_2CrO_4$ from chromite ore and $(ii) K_2MnO_4$ from pyrolusite ore.
An aromatic compound $'A\ ’$ on treatment with $\ce{CHCl_3/ KOH}$ gives two compounds $'B\ ’$ and $'C\ ’.$ Both $B$ and $C$ give the same product $'D\ ’$ when distilled with zinc dust. Oxidation of $D$ gives $E$ having molecular formula $\ce{C_7H_6O_2}.$ The sodium salt of $E$ on heating with sodalime gives $F$ which may also be obtained by distilling $A$ with zinc dust. Identify $A$ to $F.$
Explain the general characteristics of actinoids in the following terms:
(i) Physical properties
(ii) Chemical reactivity
(iii) Magnetic properties
(iv) Ionization enthalpy.
A first order reaction takes 30 min for 50% completion, what would be time for its 90% completion.
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