Explain why cyanide undergoes 1,2-addition instead of 1,4-addition in the reaction given below.

Draw the products of the following reaction. Ignore stereoisomers.

Draw the 1,2- and 1,4-addition products in the reaction of the below-given compound with HBr and label them as the kinetic and the thermodynamic products. Do not include stereoisomers.

Draw the 1,2- and 1,4-addition products in the reaction of the below-given compound with HBr and label them as the kinetic and the thermodynamic products. Do not include stereoisomers.

The following reaction shows that the proximity of the bromide ion to carbon-2 in the transition state is the reason why the 1,2-addition product is formed at a higher rate.
Explain why it was necessary to know that the reaction was performed under kinetically controlled conditions.

Draw the major products of the following reaction. Ignore stereoisomers.

Propose the structures of the products in the reaction given below.
cyclohexa-1,3-diene + HBr (anhydrous)