In the reaction shown,the major product obtai | vedclass

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Question

(C) The reaction involves the dehydrohalogenation of $3$-bromo-$2$-methylpentane using a strong base,ethoxide ion $(C_2H_5O^-)$,in ethanol $(C_2H_5OH)

Vedclass · Accepted Answer

$2-$methylpent$-2-$ene

Vedclass · Answer

(C) The reaction involves the dehydrohalogenation of $3$-bromo-$2$-methylpentane using a strong base,ethoxide ion $(C_2H_5O^-)$,in ethanol $(C_2H_5OH)$ at elevated temperatures $(\Delta)$.This is an $E2$ elimination reaction.The base abstracts a proton from the $\beta$-carbon atoms adjacent to the carbon bearing the bromine atom.There are two types of $\beta$-hydrogens available:$1$. Protons on the $C_2$ position (leading to $2$-methylpent$-2-$ene).$2$. Protons on the $C_4$ position (leading to $3$-methylpent$-2-$ene).$3$. Protons on the methyl group attached to $C_2$ (leading to $2$-methylpent$-1-$ene).According to Zaitsev's rule,the most substituted alkene is the major product.$2$-methylpent$-2-$ene is a trisubstituted alkene,which is more stable than the disubstituted alkenes ($3$-methylpent$-2-$ene and $2$-methylpent$-1-$ene).Therefore,$2$-methylpent$-2-$ene is the major product.

In the reaction shown,the major product obtained is:

Similar Questions

Which of the following rules applies in the reaction:
$CH_3CHBrCH_2CH_3 \xrightarrow{alc. KOH}$
$(i)$ $CH_3CH = CHCH_3$ (major product)
$(ii)$ $CH_2 = CHCH_2CH_3$ (minor product)

Increasing order of reactivity of the following compounds for $S_N1$ substitution is:
$(a)$ $(CH_3)_2CH-CH_2Cl$
$(b)$ $CH_3CH_2Cl$
$(c)$ $CH_3O-C_6H_4-CH_2Cl$
$(d)$ $C_6H_5-CH_2Cl$

$S_{N}1$ and $S_{N}2$ products are the same (excluding stereoisomers) for which of the following compounds?

Identify '$X$' and '$Y$' in the following sequence of transformations: $CH_3-CH_2-CH_2Br$ $\xrightarrow{X} \text{Product}$ $\xrightarrow{Y} CH_3-CH(Br)-CH_3$.

Which of the following will give a white precipitate with $AgNO_3$?

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