Provide the reactants necessary to prepare the following compound using Robinson annulation.      

Which of the following is the aldol addition product of butanal?

A compound with molecular formula C8H14O4 exhibits a triplet at δ 1.3 (I=6), a singlet at δ 2.6 (I=4) and a quartet at δ 4.2 (I=4) in its 1HNMR spectrum. Its IR spectrum shows a strong absorption band near 1740 cm-1. What is the structure for this compound?

What is the first step in the general mechanism for nucleophilic acyl substitution?

What is the name of the compound shown below?

Which of the following compounds does not have an alpha hydrogen?

Predict the product for the following reaction.     

The acetoacetic ester synthesis, shown below, can be used to prepare 5-methyl-2-hexanone. Which one of the following alkyl bromides would be used in the synthesis?  

Which one of the following would not be expected to give a significant yield in a Dieckmann condensation?

Which of the following cannot be the starting material for the following reaction?