Which one of the following dienes is most stable? CH_3CH-CHCH-CHCH_3 CH_3CH-CHCH

Question

Which one of the following dienes is most stable? CH_3CH-CHCH-CHCH_3 CH_3CH-CHCH_3CH-CH_2 CH_3-CHCH_2CH_2CH-CH_2 CH_2-CHCH_3CH_2CH-CH_2 CH_2CHCH(CH_3)CH-CH_2 CH_3CH-C-CHCH_2CH_3 Which one of the following dienes is least stable? I II III IV A reaction under kinetic control will yield: the most stable product. the product that can be formed in the fewest steps. the product whose formation requires the smallest free energy of activation. the product with the greatest potential energy. None of these.

Explanation / Answer

(18) (A) is more stable due toconjugation

(19) IV , Cumulative dienes are unstable due to more electronic repulsions

(20) (B)

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