Characteristic IR Absorptions of Some Functional Groups Functional Group Absorpt

Question

Characteristic IR Absorptions of Some Functional Groups Functional Group AbsorptionIntensityFunctional Group Absorption (cm)Intensity C-H 2850-2960 -C-H 3020-3100 1640-1680 Alkvne Alkvl halide C-Cl C-Br 3300 600-800 2100-2260 Medium Strong, broad NH StrongCN O-H 3400-3650 3300-3500 Medium C-O 1050-1150 1030-1230 Carboxylic acid C-H C-C Carbonyl compound Weak 3030 1660-2000 1450-1600 O-H 2500-3100 Strong, broad Weak: 1670-1780 2210-2260 Nitro 1540 In the box provided, write the IR frequency or range of fiequencies that would bet distinguish between the two compounds shown. Specity which compound (A or B) will display a band at this frequency in its IR spectrum Choose the most prominent frequency. Do not inclade units in your answer. Use only the frequencies listed in the table given abore. Write the letter of the compound, follorwed by the range of frequencies, separated by a comma. Example. "A,1600-1850") Compound (A or B), IR frequency or range of frequencies

Explanation / Answer

A, 3020-3100

B, 3300

Explanation:

Compd A is an alkene , so C-H streatching will be 3020-3100 cm-1, (medium)

Compd B is an alkyne , C-H streatching will be near about 3300 cm-1(strong)

thus we can separate them

Related Questions

Navigate

• Browse (All)
• Browse C
• Subjects

---