The second step of Experiment 5's multistep synthesis is an electrophilic aromatic substitution (EAS) reaction, similar to the reactions of our Klein text. What two key mechanistic steps are always involved in EAS reactions?
A. Loss of a leaving group and proton transfer.
B. Nucleophilic attack and loss of a leaving group.
C. Nucleophilic attack and carbocation rearrangement.
D. Nucleophilic attack and proton transfer.
E. Loss of a leaving group and carbocation rearrangement.

Benzonitrile (c6h5cn) is reduced to two different products depending on the reducing agent used. treatment with lithium aluminum hydride followed by water forms k, which has a molecular ion in its mass spectrum at 107 and the following ir absorptions: 3373, 3290, 3062, 2920, and 1600 cm-1. treatment with a milder reducing agent forms l, which has a molecular ion in its mass spectrum at 106 and the following ir absorptions: 3086, 2850, 2820, 2736, 1703, and 1600 cm-1. l shows fragments in its mass spectrum at m/z = 105 and 77. propose structures for k and l and choose an explanation for how this could be concluded.