Question

16) Which one of the following is NOT an example of inductive effects on chemical structure or reactivity?

		A) Brønsted acid strength:                            HCl > HF
		B) Carbocation stability:                                (CH3)3C⊕ > CH3⊕
		C) Free radical stability:                                 (CH3)2CH• > CH3CH2•
		D) Heat of Hydrogenation for alkenes:         1-Butene > trans-2-Butene

Answer 1

Inductive effect : The movement of electron density through sigma bond as a result of electronegativity difference is know as inductive effect.

Except last example we have all single bonds and there we can get +I or -I effect.

But when we look at last example we see that heat of hydrogenation.

This depends on the more substituted alkenes. Trans 2 butene is more substituted than 1 -butene so trans-2-butene got loess heat of hydrogenation due to more stability of it.

And so this is different than others.

Answer : D ) Heat of hydrogenation for alkenes : 1 -butene > trans -2-butene