What exactly determines whether a group is “Bulky” ? I’ve never known where to draw the line between bulky and not bulky. How do I tell?

The size of the group decides whether a molecule is bulky or not.

Consider the methane molecule. It has 4 C-H bonds arranged in the 3D space and having a bond angle of 109.5 degrees.Note that these bonds are free to rotate in space as long as they remain in tetrahedral geometry.

Now i replace the three Hydrogen atoms with Methyl groups.Try to imagine the structure of the molecule- the same carbon at the centre attached to 4 carbons which in turn are attached to the 3 hydrogen atoms each.

Look at methane and see how the H are arranged in the entire 360-degree space.Now for the new molecule try to imagine how much space is available for the 12 hydrogen atoms (3 from 4 carbons) to rotate.Hardly any.In fact they will try to repel each other off.This is how we define a bulky group.Bulky groups do not allow the entry of another atom from another molecule easily(since they leave you no space to approach the central atom).

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