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23. (6) Provide the reagents needed to complete the following synthesis. -CC-H 24. (8) Provide a synthesis for the following transformation. You can use any other materials that need you but your synthesis must incorporate the starting material. 25. (8) Provide a synthesis of the following alcohol using two different Grignard reactions....just changing the halogen or workup step does not count. Carbon structures of starting materials in the two pathways must differ. F 26. (8) Provide a mechanism for the following reaction. Your mechanism must use curved arrows to represent electron movement and you must show all non-zero formal charges in order to get full credit. H Br -CC-CHICHICH H C-CH₂ Br 2 equivalents NaNH, 27. (4) Use dotted lines to represent the hydrogen bonds between the two molecules below. H H