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(A) With HI, anisole forms iodobenzene a...

(A) With HI, anisole forms iodobenzene and methyl alcohol.
(R ) `I^(-)` ion will combine with smaller group to avoid steric hindrance.

A

If both (A) and (R ) are correct and (R ) is correct explanation of (A ).

B

If both (A ) and (R ) are correct but (R ) is not correct explanation of (A ).

C

If (A) is correct but (R ) is incorrect

D

If (A) is incorrect but (R ) is correct.

Text Solution

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The correct Answer is:
D
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Greater is the stability of the substituted ammonium cation, stronger should be the corresponding amine as a base. Thus, the order of basicity of aliphatic amines should be: primary > secondary > tertiary, which is opposite to the inductive effect based order. Secondly, when the alkyl group is small, like- CH_3 group, there is no steric hindrance to H-bonding. In case the alkyl group is bigger than CH_3 group, there will be steric hinderance to H-bonding. Therefore, the change of nature of the alkyl group, e.g.,from- CH_3 to- C_2 H_5 results in change of the order of basic strength. In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices. Assertion (A): Greater is the stability of the substituted ammonium cation, stronger is the corresponding amine as a base. Reason (R): The order of basicity of aliphatic amines is: primary > secondary > tertiary.

(A) Tertiary butyl carbonion is more stable than methyl carbanion. (R) +I effect of the three methyl groups in tertiary butyl carbanion tends to make it more stable than methyl carbanion.

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. Select the correct statements among the 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?

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?

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 enantiomeric pair on treatment with HOH?

Assertion (A): 2,6-Dimethyl-4-nitrophenol (I) is more acidic than 3,5-dimethyl-4-nitrophenol (II). Reason (R ): It is due to the steric inhibition of the resonance of (-NO_(2)) group with two (Me) groups in (II).

OP TANDON-ALCOHOLS, PHENOLS AND ETHERS-ETHERS
  1. (A) Ether behaves as bases in the presence of mineral acids. (R ) Du...

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  2. (A ) The boiling point of ethanol is much higher than that of diethyl ...

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  3. (A) Phenetole on clearvage with HI yields phenol and ethyl iodide (R...

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  4. Assertion: Anisole undergoes eletctrophilic substitution at o-and p-po...

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  5. (A) With HI, anisole forms iodobenzene and methyl alcohol. (R ) I^(-...

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  6. (A) tert-Butyl methyl ether on cleavage with HI at 373K gives tert-but...

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  7. (A) The C-O-C bond angle in ethers is higher than H-O-H bond angle in ...

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  8. (A) tert-Butyl alcohol on heating with conc. H(2)SO(4) at 413K gives 2...

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  9. (A) 1-Bromo-2,2-dimethyl propane on heating with ethanol gives 2-ethox...

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  10. Assertion. t-Butyl Methyl ether is not prepared by the reaction of t-b...

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  11. (A) Oxirane are cleaved under acidic and basic conditions. (R ) The ...

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  12. (A) Diphenyl ether is prepared by Ulmann reaction as shown below : ...

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  13. Match the following :

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  14. Match the following : (d) HOCH(2)CHOHCH(2)OH underset(("excess"))...

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  15. Match the following :

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  16. How many of the following ethers can not be prepared by Williamson's s...

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  17. How many mole of 'HI' will react with

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  18. How many of the following ethers can be synthesised by typical William...

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  19. Total number of the following ethers that can be prepared by Williamso...

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  20. Examine the structural formulas shown below and identify how many c...

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