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The structures and properties can be used to describe the relation between a steric hindrance and reactivity.
I think torsional strain happens only when two groups are eclipsed in relation to their positions to each other. This strain can be relieved by rotation about the carbon carbon bond. But steric strain can happen all the time. (when two groups are eclipsed, gauge or staggered in relation to each other.)
Due to the steric crowding the tetrahedral inter-mediate can't be form and thus esterification can't take place;this is called steric retardation.
6
Steric hindrance between the two methyl groups.
2
For Sn1 reaction the rate usually increases due to steric acceleration. For example the more methyl groups a compound has i.e the more tertiary it is the faster the rate of reaction will be for an Sn1 reaction.
chair form as the steric repulsions is minimum
pharmacophore
Van der Waals strain is one example
because it bubbles upbecause it changes colour
3 (2 bonding sites & 1 lone pair)