In a special condition addition of HBr to unsymmetrical alkene takes place contrary to Markovnikov's rule .
Give the mechanism of anti Markonikov's addition of HBr to propene

In a special condition addition of HBr to unsymmetrical alkene takes place contrary to Markovnikov's rule . a) What is the special rule?

In a special condition addition of HBr to unsymmetrical alkene takes place contrary to Markovnikov's rule. What is the special condition?

Acid catalysed hydration of alkene gives alcohol. In this reaction addition of water takes place according to Markownikoff's rule. Since intermediate carbocation is formed in this reaction, rearrangement of carbocation takes place. In oxymercuration-demercuration reaction hydration of alkene takes place according to Markownikoff's rule. Oxymercuration demercuration is a better process than the catalytic hydration of alkene because in oxymercuration-demercuration, no rearrangement is possible. In hydroboration oxidation, hydration of alkene takes place as if it is according to anti-Markownikoff's addition. In hydroboration oxidation reaction rearrangement is not possible. Both in oxymercuration-demercuration and hydroboration oxidation intermediate carbocation are not formed. The product formed in the following reaction is

In the addition of HBr to propene in the absence of peroxides, the 1st step involves the addition of

Identify the incorrect statement/statements: i) Alkynes are more reactive than alkenes towards electrophilic addition reaction ii) Alkynes are less reactive than alkenes towards electrophilic addition reaction iii) Alkynes decolourise Br_2 water iv) Addition of HBr to alkynes in presence of peroxide proceeds via Markownikoff's rule : i and ii, ii and iii, I and iv, ii and iv

Assertion: Friedel-Crafts alkylation and acylation of benzaldehyde do not take place . Reason : Under the above reaction conditions aldehyde group gives addition reaction. : If both assertion and reason are correct and reason is the correct explanation of assertion., Both assertion and reason are correct but reason is not the correct explanation of assertion, If assertion is correct and reason is not correct, Assertion is wrong and reason is correct