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(C) Let us analyze each option:$A$: The stability of carbocations follows the order: $3^{\circ} > 2^{\circ} > 1^{\circ} > 	ext{methyl}$. Thus,$(CH_3)

Vedclass · Accepted Answer

Order of heat of hydrogenation: $2	ext{-methylbut-2-ene} > 2	ext{-methylbut-1-ene} > 3	ext{-methylbut-1-ene}$

Vedclass · Answer

(C) Let us analyze each option:$A$: The stability of carbocations follows the order: $3^{\circ} > 2^{\circ} > 1^{\circ} > 	ext{methyl}$. Thus,$(CH_3)_3C^{+} > (CH_3)_2CH^{+} > CH_3CH_2^+ > CH_3^+$ is correct.$B$: The stability of carbanions is inversely proportional to the $s$-character of the carbon atom. $sp$ hybridized carbon $(C \equiv C^-)$ has $50\%$ $s$-character,$sp^2$ $(C=C^-)$ has $33.3\%$,and $sp^3$ $(C-C^-)$ has $25\%$. Higher $s$-character makes the carbon more electronegative,stabilizing the negative charge. Thus,the order is correct.$C$: Heat of hydrogenation is inversely proportional to the stability of the alkene. More substituted alkenes are more stable and have lower heat of hydrogenation. The stability order is $2	ext{-methylbut-2-ene} > 2	ext{-methylbut-1-ene} > 3	ext{-methylbut-1-ene}$. Therefore,the heat of hydrogenation order should be $3	ext{-methylbut-1-ene} > 2	ext{-methylbut-1-ene} > 2	ext{-methylbut-2-ene}$. This option is incorrect.$D$: Heat of combustion is proportional to the number of carbon atoms and inversely proportional to the stability of the isomer. For isomers,the more branched isomer is more stable and has a lower heat of combustion. $n	ext{-butane}$ is less stable than isobutane,so it has a higher heat of combustion. This is correct.

Which of the following options given below is incorrect?

Similar Questions

How many $1,2-$ shifts take place in the following carbocation to reach the most stable form?

Which of the following is most likely to undergo a favorable hydride shift?

State True or False for the following statements:
$(i)$ Carbon possesses $sp^2$ hybridization in a carbocation.
$(ii)$ Carbon possesses $sp^3$ hybridization in a carbocation.
$(iii)$ $A$ carbocation is formed by homolytic fission of a bond.
$(iv)$ Carbocations are very stable.

Taking into account the stability of various carbocations and the rules governing mechanisms of carbocation rearrangements,which reaction is most likely to occur during the given reaction?

Arrange the following carbanions in the decreasing order of stability:
$I. \ p-Br-C_6H_4-CH_2^-$
$II. \ C_6H_5-CH_2^-$
$III. \ p-CH_3O-C_6H_4-CH_2^-$
$IV. \ p-CHO-C_6H_4-CH_2^-$
$V. \ p-CH_3-C_6H_4-CH_2^-$
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