organic chemisrtry

What is a stretch (symmetric versus asymmetric)?

What is a bend?

ionterpreting infrared spectra
NEED HELP PLEASE!!!!!!!!!!!!!!

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  1. For stretching, think of the H2 molecule as
    H---H. Now take your left hand on the left H and your right hand on the right H and stretch it like a rubber band.

    For bending, look at the H2O molecule.
    O--H
    |
    H
    There is a stretching frequency for the OH bands. But the H atoms rock closer to each other and farther from each other also. That is the bending frequency.

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