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Substitution nucloephilic second order [...

Substitution nucloephilic second order `[S_(N)2]` involves _______ steps(s).

A

one

B

two

C

three

D

four

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The correct Answer is:
A
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Reactivity order for S_(N)1

Write down nucleophilic substitution (S_N2) order for following.

Nuclephilic substitution reaction is given by those compounds which have nucleophilic groups as leaving groups. The weaker the basicity of a group of the substrate, the better is its leaving ability. In nucleophilic substitution reactions, the basicity of leaving group should be less than the incoming nucleophilic group. Nucleophilc substitution reaction at sp^(3) -hybridised carbon is either bimolecular (S_(N^(2))) or unimolecular (S_(N^(1))) . Bimolecular reaction takes place in single step, involving transition state intermediate. In S_(N^(2)) reaction is preferred if the compound has less steric hindrance. Unimolecular (S_(N^(2))) reaction involves two steps and carbonium ion intermediate. Optically active substrates give recemic mixture in these reactions. S_(N^(2)) reaction involves transition state intermediate, hence it is favoured in which of the following solvents?

Alkylhalides have polar C-X bond and undergo nucleophilic substitution reactions. These give a variety of products with nucleophiles such as -OH, -OR, -NH_(2), -CN, -NC, -NO_(2), -ONO, RCOO^(-) , etc. They undergo mainly two types of nucleophilic substitution reactions, S_(N)1 and S_(N)2 . S_(N)1 reactions are two steps reactions which proceed through the formation of carbocations while S_(N)2 reactions are one step reaction which proceeds through the formation of transition state. The stability of carbocation and transition state determine the reactivity of alkyl halides. Arrange the following in the increasing order of reactivity towards S_(N)2 reaction:

Alkylhalides have polar C-X bond and undergo nucleophilic substitution reactions. These give a variety of products with nucleophiles such as -OH, -OR, -NH_(2), -CN, -NC, -NO_(2), -ONO, RCOO^(-) , etc. They undergo mainly two types of nucleophilic substitution reactions, S_(N)1 and S_(N)2 . S_(N)1 reactions are two steps reactions which proceed through the formation of carbocations while S_(N)2 reactions are one step reaction which proceeds through the formation of transition state. The stability of carbocation and transition state determine the reactivity of alkyl halides. Which out of S_(N)1 or S_(N)2 results into inversion of configuration?

Nuclephilic substitution reaction is given by those compounds which have nucleophilic groups as leaving groups. The weaker the basicity of a group of the substrate, the better is its leaving ability. In nucleophilic substitution reactions, the basicity of leaving group should be less than the incoming nucleophilic group. Nucleophilc substitution reaction at sp^(3) -hybridised carbon is either bimolecular (S_(N^(2))) or unimolecular (S_(N^(1))) . Bimolecular reaction takes place in single step, involving transition state intermediate. In S_(N^(2)) reaction is preferred if the compound has less steric hindrance. Unimolecular (S_(N^(2))) reaction involves two steps and carbonium ion intermediate. Optically active substrates give recemic mixture in these reactions. Which compound will give Walden inversion in S_(N^(2)) reaction?

Nuclephilic substitution reaction is given by those compounds which have nucleophilic groups as leaving groups. The weaker the basicity of a group of the substrate, the better is its leaving ability. In nucleophilic substitution reactions, the basicity of leaving group should be less than the incoming nucleophilic group. Nucleophilc substitution reaction at sp^(3) -hybridised carbon is either bimolecular (S_(N^(2))) or unimolecular (S_(N^(1))) . Bimolecular reaction takes place in single step, involving transition state intermediate. In S_(N^(2)) reaction is preferred if the compound has less steric hindrance. Unimolecular (S_(N^(2))) reaction involves two steps and carbonium ion intermediate. Optically active substrates give recemic mixture in these reactions. Which among the following will give S_(N^(1)) reaction?

TARGET PUBLICATION-HALOGEN DERIVATIVES OF ALKANES AND ARENES-CRITICAL THINKING
  1. A nucleophile is:

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  2. Which is NOT the correct statement/s for the nucleophilic reagents? ...

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  3. Substitution nucloephilic second order [S(N)2] involves steps(s).

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  4. In alkaline hydrolysis of 1-bromopropane , .

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  5. The optically active product obtained from S(N)2 reaction of dextro ro...

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  6. Alkaline hydrolysis of a tertiary alkyl halide involve.

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  7. In the alkaline hydrolysis of tert-butyl bromide.

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  8. In S(N)1 reaction which of the following is TRUE?

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  9. Which of the following statements is FALSE about S(N)1 mechanism ?

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  10. Which of the following is TRUE for hydrolysis of an optically active t...

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  11. If starting compound is laevo rotatory , after the S(N)1 reaction, pro...

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  12. Which among the following structure represents sym-trichlorobenzene?

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  13. Chlorobenzene is .

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  14. Arrange the following compounds in order of increasing dipole moment: ...

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  15. Which of the following cannot be prepared by direct halogenations of b...

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  16. Benzenediazonium salt when simply mixed with KI, gives off .

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  17. The phenomenon in which atoms or groups in a compound can attract elec...

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  18. Example of species showing -I effect is .

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  19. It is easy to substitute -Cl in 2,4-dinitrochlorobenzene than in chlor...

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  20. In aryl halides , the reactivity is controlled by stronger and 0. p or...

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