Pick out the wrong statement.

• In case of heat transfer by purely forced convection, GR/Re2 ≤ 1.
• The equivalent diameter of heat transfer for a duct of square cross-section (having each side as 'x') is equal to 4x.
• Distillation process is not the same as evaporation.
• The effectiveness of nucleate boiling depends basically on the ease with which the bubbles are formed and detached from the heating surface.