Which of the following gives the highest yiel | vedclass

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(A) The reaction of alkyl halides with $C_2H_5ONa/C_2H_5OH$ proceeds via an $E2$ elimination mechanism.For $2$-halopentanes,the elimination can occur

Vedclass · Accepted Answer

$2$-iodopentane

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(A) The reaction of alkyl halides with $C_2H_5ONa/C_2H_5OH$ proceeds via an $E2$ elimination mechanism.For $2$-halopentanes,the elimination can occur at $C_1$ or $C_3$ to form $1$-pentene or $2$-pentene,respectively.According to Zaitsev's rule,the more substituted alkene ($2$-pentene) is the major product.Among the halogens,iodine is a better leaving group than bromine.Therefore,$2$-iodopentane $(CH_3CH(I)CH_2CH_2CH_3)$ undergoes faster elimination and provides a higher yield of the more stable $2$-pentene compared to $2$-bromopentane.

Which of the following gives the highest yield of $2$-pentene upon reaction with $C_2H_5ONa/C_2H_5OH$?

Similar Questions

Arrange the following alkyl halides in the increasing order of their reactivity towards nucleophilic substitution reaction:
$(I)$ $CH_3CH_2CH(Cl)CH_3$
$(II)$ $CH_2=CHCH(Br)CH_3$
$(III)$ $CH_2=CHCH(Cl)CH_3$
$(IV)$ $CH_3CH=C(Br)CH_3$

The product obtained from the reaction is:

Which of the following alkyl halides is most reactive towards substitution by the $S_{N}1$ mechanism?

Which of the following compounds will undergo racemisation when hydrolysed by an aqueous $KOH$ solution?
$(i)$ $C_6H_5CH_2Cl$
$(ii)$ $CH_3CH_2CH_2Cl$
$(iii)$ $(CH_3)_2CHCH_2Cl$
$(iv)$ $CH_3CH(Cl)C_2H_5$

Identify the major product $X$ in the following reaction: $CH_3-CH_2-CHF-CH_3 \xrightarrow[\Delta]{alc. KOH} X$ (Major)

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