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NEET CHEMISTRYHard

The compound that forms a linear polymer due to hydrogen bonding is:

A

H2OH_{2}O

B

NH3NH_{3}

C

HBrHBr

D

HClHCl

Step-by-Step Solution

Hydrogen bonding results in the association of molecules into different types of structures based on the number of bonds formed per molecule:

  1. Hydrogen Fluoride (HFHF): Due to the high electronegativity of fluorine, HFHF forms strong intermolecular hydrogen bonds. Each HFHF molecule typically forms two hydrogen bonds (one through HH and one through FF), resulting in the formation of long, zig-zag chains (...HF...HF...HF......H-F...H-F...H-F...). In the context of 1D vs 3D structures, this is often referred to as a linear polymer .
  2. Water (H2OH_{2}O): Each water molecule can form up to four hydrogen bonds with neighbouring molecules. This leads to an extensive three-dimensional network rather than a linear chain .
  3. Ammonia (NH3NH_{3}): Like water, ammonia forms a three-dimensional network in its solid state due to hydrogen bonding.
  4. HClHCl and HBrHBr: These molecules have very weak dipole-dipole interactions and negligible hydrogen bonding because the electronegativity of ClCl and BrBr is not high enough to facilitate strong H-bonds like FF, OO, or NN .

Note: This question appears to contain a typo in the options. In the original AIPMT 2000 paper, Option C was HFHF, which is the correct answer. Given the current options, none are scientifically accurate for a linear polymer structure, and NH3NH_{3} (the Probable Answer) is a 3D network.

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