12. Give the starting materials or products (whatever is missing) for the following reactions: a. CH3C(CH2)3CCH3 b. 12 b. || NaOH(aq) heat OH- heat H2/Pd-C CH3CH2CH2CHCHO CH3 A Grignard reagent that is a key intermediate in the industrial synthesis of vitamin A can be prepared in the following way: 1. liq NH3 H3O+ 2 C2H5MgBr A (CHO) B HO C (C6H6Mg2Br₂O) Li 2. NH

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A: answer attached below Explanation:Step 1: Step 2: Step 3: Step 4:

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A:

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