How the addition of hydrogen halide takes place in case of unsymmetrical alkenes ?

In case of unsymmetrical alkenes the addition of hydrogen halide takes place according to the markovnikov’s rule . During this reaction under markovnikov’s rule the positive part of the attacking reagent joins with the carbon with more number of Hydrogen and the negative part of attacking reagent joins with the more substituted carbon.

How we can prepare dibromoethane from ethene ?

We can make the dibromoethane from ethene by the addition of halogen in ethene , in the presence of carbon tetrachloride. In the presence of ether as a solvent the above reaction takes place. The dihalo products are formed in which the halogen groups are present on adjacent carbon atoms.

Mechanism for electrophillic addition reactions of alkenes

The mechanism involves the following steps :- Step 1 :- In first step the polarity is developed on the bromine molecule , and the partial positive side of the bromine molecule attacks on the carbon atom of the double bond. This leads to the formation of carbocation. Step 2 :- In second step the negativeContinue reading “Mechanism for electrophillic addition reactions of alkenes”

Why the alkenes give electrophillic addition reactions ?

Alkenes give electrophillic addition reactions because of the following reasons:- 1. The pie electrons of the double bond attract electrophiles . 2. The electron density is more on the C-C double bond , so the electrophiles preferably attack on it as compared to the electrophiles which are repelled.

What is the mechanism of acidic dehydration of monohybrid alcohol ?

The complete mechanism takes place in three steps as shown below :- Step 1 :- Step 1 involves the release of Hydronium ion (proton) and then the attack of proton on the lone pair electrons of oxygen. By this way protonated alcohol is formed. Step 2 :- This step is slow and rate determining step.Continue reading “What is the mechanism of acidic dehydration of monohybrid alcohol ?”

How we can do aromatisation in alkanes ? How n hexane can be converted into benzene ?

The aromatisation of alkanes can be carried out under rigorous conditions. N-hexane can be converted into benzene, under the high condition of pressure that is 10 to 20 atmospheric pressure and temprature nearly 773 kelvin. Firstly we will get cyclohexane, on further dehydrogenation we get the benzene as shown below.

How we can prepare 2-methylpropane or isobutane from Butane ? Or What are the isomerisation reactions shown by alkanes ?

The Alkanes show isomerisation reactions in which one isomer is converted to another isomer under certain conditions. We can convert the Butane into isobutane by treating it with Aluminium chloride and Hydrochloric acid at 573 kelvin temprature.

What are the products of the catalytic oxidation in alkanes.

The catalytic oxidation of alkanes leads to the formation of alcohols , aldehydes and carboxylic acids under various conditions . The detailed reactions are as follows :- 1. Prepration of alcohol on reaction with oxygen in the red hot copper tube. 2. Preparation of aldehyde This reaction takes place in the presence of Molybodinum trioxide.Continue reading “What are the products of the catalytic oxidation in alkanes.”

Mechanism of substitution reactions of Alkanes

This kind of reactions involve the formation of free radical intermediates. Following are the steps of mechanism :- Step 1 :- Chain initiation In this step the bond in halide molecule breaks by a homolytic cleavage . And this leads to the formation of free radicals. Step 2 :- Chain propagation In this step theContinue reading “Mechanism of substitution reactions of Alkanes”