Question

compare the carbon -carbon bond energy and carbon -hydrogen bond energy in propane and cyclopropane

Answer 1

Answer:

Maximum amount of heat is released when the most unstable reactant changes to a stable product.

Refer to Image

3 membered ring is most unstable due to a very high angle strain. As C in cyclopropane is Sp

3

hybridised.

Excepted bond angle =104

o

Actual bond Angle =120

o

∴ high angle strain and hence it release maximum amount of heat.