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The stability of a carbonium ion depends...

The stability of a carbonium ion depends upon : the bond angle of the attached group, the substrate with which it reacts, the inductive effect and hyper-conjugative effect of the attached group, None of the above

A

the bond angle of the attached group

B

the substrate with which it reacts

C

the inductive effect and hyper-conjugative effect of the attached group

D

None of the above

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The correct Answer is:
C
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Paragraph The acidic strength of saturated aliphatic carboxylic acids depends mainly upon the inductive effect of the substitutent and its position w.rt, the -COOH group. Whereas electron donating substitutents tend to decrease, electron withdrawing substitutents tend to increase the acid strength. The acidic strength of aromatic carboxylic acids, on the other hand, depends upon both the inductive and the resonance effect of the substitutents. Which of the following is obtained when 4-methylbenzenesulphonic acid is hydrolysed with excess of sodium acetate?

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Paragraph Carboxylic acids are distinctly acidic because they ionize in water to give hydronium ions: RCOOH+H_(2)O hArr RCOO^(-) +H_(3)O^(+) The acidic strength depends upon the extent of ionizations of the acid and the stability of the anion formed. The acidic strength can also be expressed in terms of dissociation constant K_(a) or pK_(a) which are related as pK_(a)= -log K_(a) . Most unsubstituted carboxylic acids have K_(a) values in the range of 10^(-4) to 10^(-5) (pK_(a) =4-5) . The substitutents have marked effect on the acidic strength of carboxylic acids. Any group that stabilizes the carboxylate ion more than the carboxylic acid group will increase the acidic strength, and the group which destabilizes the carboxylate group more than the carboxylic acid group will decrease the acidic strength. In a similar manner, the electron-releasing groups makes benzoic acid weaker, while the electron-withdrawing groups make benzoic acid stronger. The ortho isomer of every substituted benzoic acid (whether electron releasing or electron withdrawing) is the strongest among the three isomers due to ortho effect. Which of the following is the weakest acid?

Paragraph Carboxylic acids are distinctly acidic because they ionize in water to give hydronium ions: RCOOH+H_(2)O hArr RCOO^(-) +H_(3)O^(+) The acidic strength depends upon the extent of ionizations of the acid and the stability of the anion formed. The acidic strength can also be expressed in terms of dissociation constant K_(a) or pK_(a) which are related as pK_(a)= -log K_(a) . Most unsubstituted carboxylic acids have K_(a) values in the range of 10^(-4) to 10^(-5) (pK_(a) =4-5) . The substitutents have marked effect on the acidic strength of carboxylic acids. Any group that stabilizes the carboxylate ion more than the carboxylic acid group will increase the acidic strength, and the group which destabilizes the carboxylate group more than the carboxylic acid group will decrease the acidic strength. In a similar manner, the electron-releasing groups makes benzoic acid weaker, while the electron-withdrawing groups make benzoic acid stronger. The ortho isomer of every substituted benzoic acid (whether electron releasing or electron withdrawing) is the strongest among the three isomers due to ortho effect. Which of the following statement is not correct?

BRILLIANT PUBLICATION-ORGANIC CHEMISTRY : SOME BASIC PRINCIPLES - PART II (ISOMERISM AND REACTION MECHANISM) -LEVEL-II (ASSERTION-REASON TYPE)
  1. The stability of a carbonium ion depends upon : the bond angle of t...

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  2. Assertion : Simple carbanions are usually pyramidal but allyl carbanio...

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  3. Assertion : All the carbon atoms of but-2-ene lie in one plane. Reas...

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  4. Assertion : A free radical is paramagnetic species. Reason : A free ...

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  5. Assertion : Tertiary carbocations are generally formed more easily tha...

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  6. Assertion : tert-Butyl carbanion is more stable than methyl carbanion....

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  7. Assertion : The order of stability of carbocations are R(3)C^(+)gtR(2)...

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  8. Assertion : 1^(@) allylic halides are more reactive than 1^(@) RX in S...

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  9. Assertion : Crown ether acts as phase transfer catalysis and increases...

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  10. Assertion : RS^(Theta) is a stronger nucleophile and a better leaving ...

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  11. Assertion : E(1)cB reaction is favoured by stabilisation of carbanion ...

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  12. Assertion : Inductive effect is responsible for the dipole moment in t...

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  13. Assertion : A carbanion is pyramidal in shape like NH(3) and amines. ...

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  14. Assertion : Hybridisation influences the bond length and bond enthalpy...

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  15. Assertion : Rotation about C = C is restricted. Reason : Electron ch...

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  16. Assertion : Heterolytic fission involves breaking of bond in such a wa...

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  17. Assertion : The order of reactivity of carbocations is 3^(@)gt2^(@)1^(...

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  18. Assertion : When inductive and electromeric effects operate in opposit...

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  19. Assertion : 1^(@) allylic halides are more reactive than 1^(@) RX in S...

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  20. Assertion : Rate of ethanolysis of 1^(@) halide by S(N)1 mechanism is...

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  21. Assertion : Allyl and benzyl carbonium ions are more stable than propy...

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