MCQ
Which of the among is strongest base ?
- A$C_6H_5NH_2 (K_b = 3 \times 10^{-13})$
- B$C_6H_5NHCH_3 (K_b = 4 \times 10^{-11})$
- C$C_6H_5N(CH_3)_2 (K_b = 3 \times 10^{-12})$
- ✓$C_6H_5NHC_2H_5 (K_b = 2 \times 10^{-9})$
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$(a)$ $X < Y < Z$ $(b) X < Z < Y$
$(c) Y < Z < X$ $(d) Z < Y < X$
| $LIST-I$ $(Substances)$ | $LIST-II$ $(Element Present)$ |
| $A$. Ziegler catalyst | $I$. Rhodium |
| $B$. Blood pigment | $II$. Cobalt |
| $C$ .Wilkinson catalyst | $III$. Iron |
| $D$. Vitamin $\mathrm{B}_{12}$ | $IV$. Titanium |
Choose the correct answer from the options given below:
$[Co(en)_3]\,[Cr(C_2O_4)_3]$
$[Cu(NH_3)_4]\, [CuCl_4]$
$[Ni(en)_3]\,[Co(NO_2)_6]$