CHEMISTRY SOLUTION

 

 https://drive.google.com/file/d/1ckfrmIuuF0nVx3I-Vk8fNxrlJHjvMfdN/view?usp=drivesdk

  With a p K b  of 0.4, guanidine is a strong base. This is the basicity

 Dimerization of benzyne  Please comment if you have any doubt.

  M ethanol more acidic than water, while ethanol is a weaker acid than water Methanol>Water>Ethanol>Ethyne. Methanol is slightly more acidic than water . All other aliphatic alcohols, however, are less acidic than water.