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प्रश्न
Which of the following statements are correct about the kinetics of this reaction?
(i) The rate of reaction depends on the concentration of only (b).
(ii) The rate of reaction depends on concentration of both (a) and (b).
(iii) Molecularity of reaction is one.
(iv) Molecularity of reaction is two.
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उत्तर
(i) The rate of reaction depends on the concentration of only (b).
(iii) Molecularity of reaction is one.
Explanation:
SN1 occurs in two steps. I, the polarized \[\ce{C - Cl}\] bond undergoes slow cleavage to produce a carbonation and a chloride ion. The carbocation thus formed is then attacked by nucleophile in step II to complete the substitution reaction. Step I is the slowest and reversible. It involves the \[\ce{C - Cl}\] bond breaking for which the energy is obtained through salvation of halide ion with the proton of protic solvent. Since the rate of reaction depends upon the slowest step, the rate of reaction depends only on the concentration of alkyl halide and not on the concentration of hydroxide ion. So, the rate-determining step is unimolecular.
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संबंधित प्रश्न
Which would undergo SN1 reaction faster in the following pair and why?
In the following pair of halogen compounds, which compound undergoes a faster SN1 reaction?
SN1 reactions are accompanied by racemization in optically active alkyl halides.
Which would undergo SN2 reaction faster in the following pair and why ?
CH3 – CH2 – Br and CH3 – CH2 – I
Answer the following question.
Write one stereochemical difference between SN1 and SN2 reactions.
Which of the following is a primary halide?
Which one of the following halogen compounds is difficult to be hydrolysed by SN1 mechanism?
The order of reactivities of the following alkyl halides for an SN2 reaction is:
SN2 mechanism proceeds through intervention of ____________.
Isopropyl chloride undergoes hydrolysis by:
The process of separation of a racemic modification into d and l-enantiomers is called ____________.
SN1 reaction of alkyl halides lead to ___________.
Identify the end product (C) in the following sequence:
\[\ce{C2H5OH ->[SOCl2][Pyridine] A ->[KCN {(alc.)}] B ->[2H2O/H^+] C}\]
Which of the following undergoes nucleophilic substitution exclusively by SN1 mechanism?
The correct order of increasing the reactivity of C–X bond towards nucleophile in following compounds.
(I)
(II)
(CH3)3CCl
(III)
(CH3)2CHCl
(IV)
When CH3CH2CHCl2 is treated NaNH2 product formed is:-
CCl4 is insoluble in water because:-
In SN1 reactions, the correct order of reactivity for the following compounds:
CH3Cl, CH3CH2Cl, (CH3)2CHCl and (CH3)3CCl is ______.
Complete the reaction with the main product formed:
HCI, Major product ______.
