Below is an abbreviated table showing the infrared absorption frequencies associ

Question

Below is an abbreviated table showing the infrared absorption frequencies associated with stretching between pairs of atoms in some common organic functional groups. The frequency ranges have been chosen to minimize overlap.  The actual frequencies occur in broader ranges.

Variation: 6/60

Below is a simulated infrared spectrum of the product of the above synthesis. An additional step not in the written procedure has been conducted - namely, re-crystallization of the product from benzonitrile (A benzene ring with a -C?N group.).

Does the infra-red spectrum indicate the presence of any vanillyl alcohol in the product?

A. Yes

B. No

C. Cannot determine from the spectrum

  

Does the infra-red spectrum indicate the presence of any of the starting material, vanillin, in the product?

A. Yes

B. No

C. Cannot determine from the spectrum

  

Question 11

Does the infra-red spectrum indicate the presence of any benzonitrile, the solvent from which the product was recrystallized, in the product?

A. Yes

B. No

C. Cannot determine from the spectrum

Frequency (cm-1) Bond Functional Group 3500 - 3400 O-H alcohols, aliphatic (not on benzene ring) 3250 - 3150 ?-OH phenols- OH group directly connected to benzene ring 2950 - 2900 C-H aromatics - H directly bonded to a ring carbon 2850 - 2800 C-H aliphatic - (no benzene ring(s)) 2250 - 2200 C?N nitriles 1720 - 1670 C=O aldehydes 1620 - 1580 C?C in ring aromatics 1510 - 1470 C?C in ring aromatics

Explanation / Answer

Does the infra-red spectrum indicate the presence of any vanillyl alcohol in the product?

Ans yes based on the -oh streching we can say and aroatic streching is also there

Does the infra-red spectrum indicate the presence of any of the starting material, vanillin, in the product?

Ans: Yes

babased on the carbonyl streching value we can say

Does the infra-red spectrum indicate the presence of any benzonitrile, the solvent from which the product was recrystallized, in the product

Ans: yes

based on CN streching value we can say

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