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Which of the following substituents is an ortho, para director?

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

Rank the following compounds in order of increasing reactivity towards chlorination with Cl2/AlCl3 (slowest reacting to fastest).

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

Which one of the following compounds will be least reactive towards a Friedel-Crafts reaction?

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?  

Which of the following compounds is most reactive towards a nucleophilic addition reaction?

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