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- The two Grignard reactions and the reduction reaction below are all believed to have similar mechanisms. Use the curved arrow formalism to draw a single mechanism for these reactions using :Nuc-1 to indicate the nucleophile. The reacations are: cyclohexylmagnesium chloride + acetone in ether --> 2-cyclohexyl-2-propanol phenylmagnesium bromide + acetone in ether --> 2-phenyl-2-propanol Acetone + NaBH4 --> 2-propanol3-Bromocyclohexene is a secondary halide, and benzyl bromide is a primary halide. Both halides undergo SN1 substitution about as fast as most tertiary halides. Use resonance structures to explain this enhanced reactivity.Rank the primary, secondary, tertiary, and aryl halides in terms of reactivity with the nucleophile. Which type of halide react faster by an SN2 reaction? Explain