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Which of the following statements is correct?

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The major product in the dehydrohalogenation of 2-chloro-2,3-dimethylbutane is 2,3-dimethyl-1-butene.

The order of reactivity of n-propyl bromide, isobutyl bromide and ethyl bromide towards E2 dehydrohalogenation is ethyl> n-propyl > isobutyl.

Of the simple dialkyl ethylenes, the cis isomer is more stable than the trans isomer.

If enthalpy of combustion of cis-2-butene is more negative than trans-2-butene, then the conversion of cis to trans isomer is exothermic.

answer is D.

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Detailed Solution

(a) According to Saytzeff's rule, the more substituted alkene is more stable and is thus a preferred product. Thus, the major product is

(b) Reactivity in E2 dehydrohalogenation depends mainly upon the stability of the alkenes being formed.

According to Saytzeff's rule, the stability of alkenes increases with increase in the number of substituents on the doubly bonded carbons. Hence, the order of reactivity towards dehydrohalogenation is isobutyl > n-propyl > ethyl

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