Which of the following dienes is the most stable?

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${BrCH}_{2} CHBrCH = CHCH = {CH}_{2}$

${BrCH}_{2} CH = CHCHBrCH = {CH}_{2}$

$H_{2} C = CH - CHBrCHBrCH = {CH}_{2}$

${BrCH}_{2} CH = CHCH = {CHCH}_{2} Br$

answer is B.

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Detailed Solution

1-bromo ethene dienes is the most stable.

Due to elements such as charge delocalization through resonance and hybridization energy, conjugated dienes (both isolated and cumulated) are more stable than non-conjugated dienes. The discrepancies between isolated and conjugated alkenes in the energy required for hydrogenation show this stability.

Hence, option B is correct.

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