NMR

Question 1

uses of CDCl3 or CCl4

Answer 1

CDCl3 or CCl4 as as SOLVENT
inert too so wont react with sample
They dont have H atoms so wont give readings on H NMR
CDCl3 is polar solvent - good for polar organic molecules
CCl4 non polar so good for non polar ones

Question 2

Use of TMS and its formula

Answer 2

Si(CH3)4 inert too
As a reference since theres a peak at 0 ppm