The kinetic product of a reaction. a) is favored under equilibrium conditions b)
ID: 537553 • Letter: T
Question
The kinetic product of a reaction. a) is favored under equilibrium conditions b) is favored at higher temperature c) in favored at lower temperature d) is the most stable product The hydrogenation of a conjugated diene is less exothermic than that of a non-conjugated diene because. a) the conjugated diene is more reactive. b) the conjugated diene is more stable. c) the non-conjugated diene is more stable. d) the conjugated diene is less stable. The "pi-cloud" of a conjugated diene results from side-to-side interaction of adjacent p orbitals on the carbon atoms. How many p-orbitals interact in this manner in a conjugated diene? a) 2 b) 4 c) 6 d)8 Which carbocation in most stable? CH_3 CH_2 b) CH_3 CH CH_3 c) CH_2 = CHCHCH_3 d) CH_2 = CHCH_2 CH_2Explanation / Answer
Ans 4 - (c) is favoured at lower temperature
Running the reaction at the lowest temperature possible (where it still proceeds) will tend to favour the kinetic product, as the starting materials will only just have enough energy to cross the lowest barrier to the corresponding kinetic product.
Ans 5 - (b) the conjugated diene is more stable.
When using electrostatic potential maps, it is observed that the pi electron density overlap is closer together and delocalized in conjugated dienes, while in non conjugated dienes the pi electron density is located differently across the molecule. Since having more electron density delocalized makes the molecule more stable. Conjugated dienes are more stable than non conjugated dienes.
Ans 7 - (d) CH2=CHCH2CH2+
Stability of all allyl carbocation > vinyl carbocation > tertiary > secondary > primary carbocation due to Allylic carbocations enjoy resonance stabilization by delocalization of the positive charge to the adjacent bond(s).
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