Out of
SN 1 reaction and why?
In the SN1 reaction the formation of carbocation is the rate determining step, and also the stability of carbocation would determine its reactivity.
The order of stability of carbocation is given as Tertiary>Secondary> Primary> methyl.
Here, 1-chloro-1-methylpropane would form a secondary carbocation, while 1-chloro-2- methylpropane would form a primary carbocation, which is less stable than secondary carbocation. Hence, reactivity towards the SN1 reaction would be higher for 1-chloro-1- methylpropane.
Give reasons for the following:
(i) Ethyl iodide undergoes SN2 reaction faster than ethyl bromide.
(ii) (±) 2-Butanol is optically inactive.
(iii) C -X bond length in halo benzene is smaller than C -X bond length in CH3- X.
Write the structure of an isomer of compound C4H9Br which is most reactive towards SN1 reaction.
Answer the following question:
(i) What is meant by the chirality of a compound? Give an example.
(ii) Which one of the following compounds is more easily hydrolyzed by KOH and why?
CH3CHCICH2CH3 or CH3CH2CH2Cl
(iii) Which one undergoes S N 2 substitution reaction faster and why?
Give reasons for the following:
(i) Phenol is more acidic than ethanol.
(ii) The boiling point of ethanol is higher in comparison to methoxymethane.
(iii) (CH3)3C - O - CH3 on reaction with HI gives CH3OH and (CH3)3C -I as the main products and not (CH3)3C -OH and CH3I.
Given reasons:
(i)C–Cl bond length in chlorobenzene is shorter than C–Cl bond length in CH3–Cl.
(ii)The dipole moment of chlorobenzene is lower than that of cyclohexyl chloride.
(iii)SN1 reactions are accompanied by racemization in optically active alkyl halides.
