Arrange the following compounds in increasing order of C - OH bond length:

Question:

Arrange the following compounds in increasing order of $\mathrm{C}$ - OH bond length: methanol, phenol, $p$-ethoxyphenol

 

  1. methanol $

  2. phenol $<$ methanol $

  3. phenol $

  4. methanol $<$ phenol $

Correct Option:

Solution:

Resonance is a deciding factor to determine the order of bond length in given compounds. Phenol exhibits least $\mathrm{C}-\mathrm{OH}$ bond length due to resonance whereas methanol will show maximum bond length due to lack of resonance and $p$-ethoxyphenol will have some intermediate value of bond length.

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