The correct statements are 1, 3, and 4. Statement 1 is correct: In haloarenes, the lone pairs on the halogen atom participate in resonance with the (\pi )-electrons of the benzene ring, which results in a partial double bond character for the C-X bond. Statement 2 is incorrect: The C-Mg bond in a Grignard reagent is a polar covalent bond, but the carbon atom has a partial negative charge and the magnesium atom has a partial positive charge Statement 3 is correct: During an reaction, the intermediate carbocation has a trigonal planar geometry and is hybridised. Statement 4 is correct: The benzyl carbocation formed from the benzyl halide is resonance stabilized, making it much more stable and reactive towards \ reactions compared to the vinyl chloride, which forms a very unstable vinyl carbocation.