Describe how IR spectroscopy might be used to monitor the progress of each of the following reactions. Choose the correct explanation. In an equation, the reactant has a SMILES string of C1CNCC=C1 reacts with iodomethane, C H 3 I, to yield a product that has a SMILES string of CN1CCC=CC1. The starting material is a secondary amine and is expected to produce a typical signal for an N―H stretch at around 4300 cm-1. In contrast, the product is a tertiary amine and is not expected to produce a signal above 2000 cm-1. The starting material is a secondary amine and is expected to produce a typical signal for an N―H stretch at around 3000 cm-1. In contrast, the product is a tertiary amine and is not expected to produce a signal above 3400 cm-1. The starting material is a secondary amine and is expected to produce a signal for an N―H stretch at around 3400 cm-1. In contrast, the product is a tertiary amine and is not expected to produce a signal above 3000 cm-1. The starting material is a secondary amine and is expected to produce a typical signal for an N―H stretch at around 4500 cm-1. In contrast, the product is a tertiary amine and is not expected to produce a signal above 4000 cm-1.