Which of the following alkenes exhibit E-Z isomerism? I. l-chloropropene[ClCHCHC

Question

Which of the following alkenes exhibit E-Z isomerism? I. l-chloropropene[ClCHCHCH_3] II. 2-chloropropene [CH_2CCICH_3] III. 3-chloropropene [CH_2CHCH_2Cl] A) only I B) I and II C) II and III D) I and III What is the slow, rate-determining step, in the acid-catalyzed dehydration of 2-methyl-2-propanol? A) Protonation of the alcohol to form an oxonium ion. B) Loss of water from the oxonium ion to form a carbocation. C) Loss of a beta-hydrogen from the carbocation to form an alkene. D) The simultaneous loss of a beta-hydrogen and water from the oxonium ion. Based on Zaitsev's rule, which of the following is the major product of the reaction below? Which alkene of formula C_5H_10 gives off the least heat (per mol) when burned?

Explanation / Answer

(32) (A) Only I exhibits E - Z iosmerism.Becaus ethe doubly bonded carbons have diffrent substituents.

(33) (B) Loss of water molecule from oxonium ion is slow and rate determining step.

(34) (C) According to Zaitsev's rule more stable alkene is obtained as major product.

(35) (B) More substituted alkene is more stable. If more is the stability less is the heat of combustion.

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