The structure of the major product formed in the following reaction is:
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Nucleophilic substitution reactions with AgCN typically result in the replacement of halides (such as Br) by the cyanide group (CN) due to the strong nucleophilic nature of cyanide.
- In the given reaction, the halide (Br) group reacts with AgCN (silver cyanide), replacing the bromine atom with the cyanide group (CN) via nucleophilic substitution.
- This substitution results in the formation of the major product where the cyanide group (NC) is attached to the benzene ring in place of the bromine atom.
Final Answer: Option (4).
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Approach Solution -2
Step 1: Understand the reaction.
The given reaction is:
\[
H_2(g) + I_2(g) \rightleftharpoons 2HI(g).
\]
This is a reversible reaction where hydrogen (H₂) and iodine (I₂) react to form hydrogen iodide (HI).
Step 2: Analyze the graph.
The graph shows the molar concentration of H₂, I₂, and HI as a function of time. The concentrations of H₂ and I₂ decrease as the reaction proceeds, while the concentration of HI increases. Eventually, the concentrations of all the species level off, indicating that equilibrium has been reached. At equilibrium, the rates of the forward and reverse reactions are equal, and the concentrations remain constant.
Step 3: Conclusion.
The graph correctly shows the attainment of equilibrium. The concentrations of the reactants (H₂ and I₂) decrease, and the concentration of the product (HI) increases until a constant value is reached for all three species, indicating equilibrium.
Final Answer:
\[
\boxed{\text{The graph in the image correctly predicts the attainment of equilibrium.}}
\]
