What is the sample container in an IR spectrophotometer and why?

Here are the solutions for questions 1 to 12:

1. The sample container in IR spectrophotometer is made of
Infrared (IR) spectrophotometers require sample containers made of materials that are transparent to IR radiation. Glass and quartz absorb IR radiation, making them unsuitable. Sodium chloride (NaCl) is commonly used because it is transparent to IR light.

• Answer: (C) sodium chloride

2. How many peaks would you expect from each of the 3 signals in the high resolution proton NMR of CH₃CH₂CH₂NO₂
We apply the N+1 rule for proton NMR splitting, where N is the number of equivalent adjacent protons.

• For the CH₃ group: It has 2 adjacent protons (from the CH₂