IR Spectroscopy 

Functional Group

• Carboxylic Acid   * with an alcohol     * has an -OH stretch from 2500-3300cm-1   * C double bond to O at 1700cm-1
• Alcohol   * strong stretch from 3200-3600cm-1
• Aldehyde   * Has a carbonyl group   * C double bond to O at 1700com-1   * C-H stretch at 2900cm-1   * Is on the right side of the longer peak (C-H)
• Ketone   * Has a carbonyl group   * C double bond to O at 1700cm-1
• Ester   * Has a carbonyl functional group   * C double bond to O at 1700cm-1     * higher wave bonds absorbs more   * A Sp2 at the center of C     * C-O stretch at 1200-1300cm-1   * Sp3 at CH3     * C-O at 1000-1150cm-1
• Ether   * Sp3 on the 3rd carbon   * C double bond to O at 1000-1150cm-1

Degrees

• Amine   * Nh2- 1 degree     * at 3300-3500cm-1   * N-H - 2 degrees     * at 3300-3500com-1
• Amide   * Has a carbonyl group   * C-O stretch at 1700cm-1   * C double bond to O stretch at 330-3500cm-1     * tongue shaped

\ Hydrocarbons

• Alkane   * CH3     * 2900 stretch   * Sp3 at two peaks   * CH3 bend at 1365-1385 with a little peak above the longer peak
• Alkene   * C double bond to C     * A more thinner peak at 1660cm-1   * CH at 3000-3100cm-1   * peak is a little bit to the left side of the long two peaks with a C-H stretch and a sp2
• Alkyne   * C triple bond to C     * at 2100-2200cm-1 with an even more smaller/thinner peak     * peak is even more further away from the two peaks with a hybridization of sp

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