What is the correct decreasing order of the r | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(D) The solvolysis reaction in formic acid proceeds via an $S_N1$ mechanism,which involves the formation of a carbocation intermediate.The rate of rea

Vedclass · Accepted Answer

$III > IV > II > I$

Vedclass · Answer

(D) The solvolysis reaction in formic acid proceeds via an $S_N1$ mechanism,which involves the formation of a carbocation intermediate.The rate of reaction depends on the stability of the carbocation formed after the loss of the chloride ion $(Cl^-)$.$(I)$ forms a primary allylic carbocation: $CH_2=CH-CH_2^+$.$(II)$ forms a secondary allylic carbocation: $CH_2=CH-CH^+(CH_3)$,which is more stable than $(I)$ due to the $+I$ effect of the methyl group.$(III)$ forms a primary allylic carbocation: $CH_2=C(CH_3)CH_2^+$,which is more stable than $(I)$ due to the $+I$ effect of the methyl group,but less stable than $(II)$ because it is primary.$(IV)$ forms a primary allylic carbocation: $CH_3CH=CH-CH_2^+$,which is more stable than $(I)$ due to the $+I$ effect of the methyl group,but less stable than $(II)$ and $(III)$ due to the position of the methyl group.Comparing the stability: $(II) > (III) > (IV) > (I)$.Wait,re-evaluating: $(II)$ is secondary allylic (most stable). $(III)$ is primary allylic with a methyl group at the $2$-position (more stable than $(IV)$). $(IV)$ is primary allylic with a methyl group at the $3$-position. $(I)$ is primary allylic (least stable).Therefore,the order is $(II) > (III) > (IV) > (I)$.

What is the correct decreasing order of the relative rate of solvolysis for the following alkyl halides in formic acid containing a small amount of water?
$(I) \ CH_2=CH-CH_2Cl$
$(II) \ CH_2=CH-CH(CH_3)Cl$
$(III) \ CH_2=C(CH_3)CH_2Cl$
$(IV) \ CH_3CH=CH-CH_2Cl$

Similar Questions

Which among the following is most reactive via $S_N2$ mechanism?

Why is chloroform stored in dark-colored bottles?

Which type of rate is observed in dehydrohalogenation ($\beta$-elimination) reaction of alkyl halide?

The formation of butane nitrile is possible in which of the following reactions?

Identify the major product formed when propene is treated with hydrogen chloride followed by Swarts reaction.

Vedclass Test Series

Exam Paper Generator

Online Exam Module

What is the correct decreasing order of the relative rate of solvolysis for the following alkyl halides in formic acid containing a small amount of water?$(I) \ CH_2=CH-CH_2Cl$$(II) \ CH_2=CH-CH(CH_3)Cl$$(III) \ CH_2=C(CH_3)CH_2Cl$$(IV) \ CH_3CH=CH-CH_2Cl$