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(A) : Propene reacts with HBr to give is...

(A) : Propene reacts with HBr to give isopropyl bromide.
(R ) : Addition of hydrogen halide to alkenes follows Markownikoff's rule

A

A and R are true, R explains A

B

A and R are true, R does not explain A

C

A is true, but R is false

D

A is false, but R is true'

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The correct Answer is:
A
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Propene reacts with HBr to give isopropyl bromide but not n-propyl bromide. Why?

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(A) Addition of HBr on but-2-ene gives two structural isomeric products (R) Addition of HBr on but-2-ene follows Markownikoff's rule.

Butanone reacts with methyl magnesium bromide to from an addition product (Z ) . On hydrolysis Z gives

(A) : Benzene reacts with n-propyl chloride in presence of AlCl_(3) to give isopropyl benzene. (R ) : Benzene undergoes electrophilic substitution readily.

Addition of HX on alkene proceed through formation of carbocation . This reaction is follows Markovnikov's rule. According to markovnikov's rule addition of electrophile occurs on that carbon of alkene which have more number of -H atom Ph-CH = CH_2 underset(HX)to underset("(major)")(Ph-overset(x)overset(|)CH-CH_3) + underset("(minor)")(Ph-CH_2-CH_2-X) Arrange the following alkenes in decreasing order of reaction with HBr.

Markovnikov addition takes place with unsymmetrical alkenes. The positive part of the reagent gets connected to the double bonded carbon with more number of hydrogens. In presence of peroxide and in special cases addition takes place against Markovnikov rule. 1-methyl cyclohenene on hydroboroation it will give

Addition of HX on alkene proceed through formation of carbocation . This reaction is follows Markovnikov's rule. According to markovnikov's rule addition of electrophile occurs on that carbon of alkene which have more number of -H atom Ph-CH = CH_2 underset(HX)to underset("(major)")(Ph-overset(x)overset(|)CH-CH_3) + underset("(minor)")(Ph-CH_2-CH_2-X) Which of the following alkenes will give markovnikov's reaction ?

AAKASH SERIES-ACYCLIC HYDROCARBONS -OBJECTIVE EXERCISE - 1
  1. The reaction conditions used for converting 1,2-dibromoethane to ethyl...

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  2. The metal used for the debromination reaction of 1, 2 - dibromeothane

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  3. (A) : Propene reacts with HBr to give isopropyl bromide. (R ) : Addi...

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  4. Baeyer's reagent is

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  5. Baeyer's reagent oxidises ethylene to

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  6. Double bond in unsaturated hydrocarbons can be located by

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  7. The products of ozonolysis of an alkene are ethanl and methanal, then ...

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  8. Ethylene on hydration gives

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  9. Polytetrafluoroethylene is commercially known as

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  10. Ethylene on ozonolysis gives

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  11. Ethyl hydrogen sulphate is obtained by reaction of H(2)SO(4) on

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  12. The product obtained when propene undergoes addition reaction with HBr...

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  13. An olefin 'X' on ozonolysis gave propanal and propanone. Then IUPAC na...

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  14. CH(2)=CH(2)+O(3)underset(H(2)O)overset(Zn)rarrXoverset("Reduction")rar...

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  15. A hydrocarbon 'X' on reduction gives 2-methyl butane. On ozonolysis it...

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  16. Which of the following is most reactive in its reaction with C(2)H(4)?

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  17. Carbon atoms show sp^(2) hybridisation in compounds A and B. A decolou...

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  18. CH(2)=CH(2)+Br(2)overset(C Cl(4))rarrXoverset("aq KOH")rarrZ.Z is

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  19. Not characteristic of ethene is

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  20. In the reaction C(2)H(4)overset(x)rarr Product, if the hybridization o...

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