Explain by giving the example of chlorobenzene that chlorine is ortho- and para-directing in electrophilic aromatic substitution reactions.
Write I.U.P.A.C. names of the following:
(i) \([Co(NH_3)_6]Cl_3\)
(ii) \([Ti(H_2O)_6]^{3+}\)
(iii) \( K_2[Ni(CN)_4] \)
(iv) \([Pt(NH_3)_2Cl_2]\)
(b) Order of the differential equation: $ 5x^3 \frac{d^3y}{dx^3} - 3\left(\frac{dy}{dx}\right)^2 + \left(\frac{d^2y}{dx^2}\right)^4 + y = 0 $