What is the slow, rate-determining step, in the acid-catalyzed dehydration of 2-methyl-2-propanol?

H2SO4
(CH3)3COH →

a. Protonation of the alcohol to form an oxonium ion.
b. Loss of water from the oxonium ion to form a carbocation.
c. Loss of a β-hydrogen from the carbocation to form an alkene.
d. The simultaneous loss of a β-hydrogen and water from the oxonium ion.

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.