In the Wurtz-Fittig reaction, alkyl halides and aryl halides react in the presence of sodium metal in dry ether to form alkyl aryl compounds: \[ C_6H_5Cl + CH_3Cl + 2Na \xrightarrow{\text{Dry Ether}} C_6H_5CH_3 + 2NaCl. \]
Explanation: Wurtz Reaction involves only alkyl halides. Fittig Reaction involves only aryl halides. Williamson Ether Synthesis is unrelated to this reaction.
For the given cell: \[ {Fe}^{2+}(aq) + {Ag}^+(aq) \to {Fe}^{3+}(aq) + {Ag}(s) \] The standard cell potential of the above reaction is given. The standard reduction potentials are given as: \[ {Ag}^+ + e^- \to {Ag} \quad E^\circ = x \, {V} \] \[ {Fe}^{2+} + 2e^- \to {Fe} \quad E^\circ = y \, {V} \] \[ {Fe}^{3+} + 3e^- \to {Fe} \quad E^\circ = z \, {V} \] The correct answer is:
Given, the function \( f(x) = \frac{a^x + a^{-x}}{2} \) (\( a > 2 \)), then \( f(x+y) + f(x-y) \) is equal to