How many compounds among the following compounds show inductive, mesomeric as well as hyperconjugation effects?
Correct Answer: 4
Solution and Explanation
Step 1: Analyze each compound - Compound 1 (−OCH3 group attached): The −OCH3 group exhibits both inductive (−I) and mesomeric (+M) effects. However, hyperconjugation is not applicable here. Not included.
- Compound 2 (Alkene with −CH3): The −CH3 group shows inductive (+I) and hyperconjugation effects due to the presence of alpha hydrogens. Mesomeric effect is not present. Not included.
- Compound 3 (−NO2 group): The −NO2 group exhibits both −I (inductive) and −M (mesomeric) effects but does not participate in hyperconjugation. Not included.
- Compound 4 (−Cl group): The −Cl group shows −I (inductive) and +M (mesomeric) effects, but no hyperconjugation. Not included.
- Compound 5 (−NO2 group): Similar to Compound 3, exhibits inductive and mesomeric effects but not hyperconjugation. Not included.
- Compound 6 (−CH3 groups attached to a benzene ring): The −CH3 groups exhibit inductive (+I) effects and hyperconjugation due to alpha hydrogens. Mesomeric effect is also observed with the aromatic ring. Included.
- Compound 7 (−COCH3 group): The −COCH3 group exhibits inductive (−I) and mesomeric (−M) effects. However, no hyperconjugation is observed. Not included.
Step 2: Final Count From the analysis, only 4 compounds exhibit all three effects: inductive, mesomeric, and hyperconjugation.
Final Answer: 4.
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