Identify following statements as true or false: 1. If a bond is non-polar due to symmetry, the vibration is said to be I

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Identify following statements as true or false:
1. If a bond is non-polar due to symmetry, the vibration is saidto be IR inactive.
2. It is nearly impossible to deduce a structure based solely ona compounds by IR spectrum.
3. Multiplicity in NMR results from magnetic affects thatprotons have on each other.
4. A peak with an integration equal to 9 suggests the presenceof a tert-butyl group.
5. The molecular ion peak is the most intense peak in a massspectrum