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Trans-(or E-)2-butene...

Trans-(or E-)2-butene

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a. Cis- 2 -butene rarr trans- 2 -butane, DeltaH_(1) b. Cis- 2 -butane rarr1 -butene, DeltaH_(2) c. Trans- 2 -butene is more stable than C is- 2 -butene d. Ethalpy of combustion of 1 -butene, DeltaH =- 649.8 kcal//mol e. 9DeltaH_(1) +5DeltaH_(2) = 0 f. Enthalpy of combustion of trans -2 -butene, DeltaH =- 647.1 kcal mol^(-1) . Calculate DeltaH_(1) and DeltaH_(2) ?

CHF_(2) Br overset(OH^(-))(rarr) (A) [Intermediate] overset("Trans -2-butene")(rarr) (B)

Correct order of stability is (A) Cis-2-butene > 1 - butene > trans - 2 - butene (B) trans--2-butane > cis-2-butene > 1 - butene (C) 1 - butene > Cis-2-butane > trans- 2 - butene (D) cis-2-butene > trans -2- butene > 1- butene А

Among the following alkenes, (I)1 - butene (II) cis -2- butene (III) trans -2- butene the decreasing order of stability is

(p) Cis-2- butene to trans -2-butene, DeltaH_(1) (Q)Cis-2-butene to 1-buture, DeltaH_(2) (R ) Trans -2-buture is more stable than cis-2-buture (S ) Enthalpy of combustion of 1-buture, DeltaH=-649.8kcal//mol (T) 9DeltaH_(1)+5DeltaH_(2)=0 (U) Enthalpy of combustion of trans -2- buture, DeltaH=-647.0kcal//mol The value of Delta H_(1) and DeltaH_(2) in kcal/mole are:

Cis-2-butene and trans-2-butene are: