English
CBSEScience (English Medium) Class 12
Question Papers2544
Textbook Solutions26831
MCQ Online Mock Tests43
Important Solutions21826
Concept Notes & Videos719
Time Tables23
Syllabus

Write the main products when methyl chloride is treated with AgCN. - Chemistry

Advertisements
Advertisements

Question

Write the main products when methyl chloride is treated with AgCN.

Solution

When methyl chloride is treated with AgCN, methyl cyanide is formed.

shaalaa.com
Hydrocarbons: Alkanes - Reactions of Haloalkanes - Nucleophilic Substitution Reactions
  Is there an error in this question or solution?
Q 18.2
2014-2015 (March) Panchkula Set 1

APPEARS IN

2014-2015 (March) Panchkula Set 1 (with solutions)
Q 18.2 | 3 marks

Video TutorialsVIEW ALL [1]

RELATED QUESTIONS

Given reasons: C–Cl bond length in chlorobenzene is shorter than C–Cl bond length in CH3–Cl.


Write the structures of A, B and C in the following:


In the following pair of halogen compounds, which compound undergoes a faster SN1 reaction?


Which compound in the following pair will react faster in SN2 reaction with OH−?

CH3Br or CH3I


What is the action of the following on ethyl bromide:
moist silver oxide


The reaction of C6H5–CH=CH–CH3 with HBr produces:


Which of the following is the definition of chirality?


When CH3CH2CHCl2 is treated NaNH2 product formed is:-


Give reason for the following:

The product formed during SN1 reaction is a racemic mixture.


The following questions are case-based questions. Read the passage carefully and answer the questions that follow:

Nucleophilic Substitution:
Nucleophilic substitution reaction of haloalkane can be conducted according to both SN1 and SN2 mechanisms. SN1 is a two-step reaction, while SN2 is a single-step reaction. For any haloalkane, which mechanism is followed depends on factors such as the structure of haloalkane, properties of leaving group, nucleophilic reagent and solvent.

Influences of solvent polarity:
In SN1 reaction, the polarity of the system increases from the reactant to the transition state, because a polar solvent has a greater effect on the transition state than the reactant, thereby reducing activation energy and accelerating the reaction. In SN2 reaction, the polarity of the system generally does not change from the reactant to the transition state, and only charge dispersion occurs. At this time, the polar solvent has a great stabilizing effect on Nu than the transition state, thereby increasing activation energy and slow down the reaction rate. For example, the decomposition rate (SN1) of tertiary chlorobutane at 25°C in water (dielectric constant 79) is 300000 times faster than in ethanol (dielectric constant 24).

The reaction rate (SN2) of 2-bromopropane and NaOH in ethanol containing 40% water is twice slower than in absolute ethanol. Hence the level of solvent polarity has an influence on both SN1 and SN2 reactions but with different results. Generally speaking, a weak polar solvent is favourable for SN2 reaction, while a strong polar solvent is favourable for SN1. Generally speaking, the substitution reaction of tertiary haloalkane is based on SN1 mechanism in solvents with a strong polarity (for example ethanol containing water).

Answer the following questions:

(a) Why racemisation occurs in SN1? (1)

(b) Why is ethanol less polar than water? (1)

(c) Which one of, the following in each pair is more reactive towards SN2 reaction? (2)

(i) CH3 – CH2 – I or CH3CH2 – Cl

(ii)

OR

(c) Arrange the following in the increasing order of their reactivity towards SN1 reactions: (2)

(i) 2-Bromo-2-methylbutane, 1-Bromo-pentane, 2-Bromo-pentane

(ii) 1-Bromo-3-methylbutane, 2-Bromo-2-methylbutane, 2-Bromo-3- methylbutane


Share
Notifications

Englishहिंदीमराठी
Login
Create free account


      Forgot password?
Course
Use app×