Suggest spectroscopic methods that could be used to identify the following in organic compounds: (i) Position of hydrogen atoms, (ii) Presence of Double bond, (iii) Arrangements of atoms in the crysta

5. (d) Suggest spectroscopic methods that could be used to identify the following in organic compounds:

• (i) Position of hydrogen atoms:

  • Nuclear Magnetic Resonance (NMR) Spectroscopy (specifically $^1$H NMR) is used to determine the number of different types of hydrogen atoms and their relative positions in a molecule.

• (ii) Presence of Double bond:

  • Infrared (IR) Spectroscopy can detect the presence of C=C (alkene) and C=O (carbonyl) double bonds by their characteristic absorption frequencies.

• (iii) Arrangements of atoms in the crystal lattice:

  • X-ray Diffraction (XRD) is used to determine the three-dimensional arrangement of atoms within a crystalline solid.