Which one of the following substituents will not direct the incoming group to the meta position during electrophilic aromatic substitution?

The compound shown below can form a hemiacetal by reacting with itself in an acidic solution.What is the structure of this hemiacetal?

Predict the product, when pentanal reacts with CH3NH2 in the presence of an acid catalyst.

What kind of reactions do aldehydes and ketones undergo?

Which of the following is the best choice to prepare the following alkene using the Wittig reaction?  

Predict the product, when cyclopentanecarbaldehyde reacts with phenylhydrazine (PhNHNH2) in the presence of an acid catalyst.

Provide the reagents necessary to carry out the following conversion. 

Predict the product, when 4-methyl-2-hexanone reacts with methylamine in the presence of an acid catalyst.

What is the product of the reaction sequence below?

Which of the following is the kinetic rate equation for the addition-elimination mechanism of nucleophilic aromatic substitution?