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For the following reactions The cor...

For the following reactions

The correct decreasing order of enthalpy of formation of carbocation is

A

`DeltaH_1 gt DeltaH_2 gt DeltaH_3 gt DeltaH_4`

B

`DeltaH_4 gt DeltaH_1 gt DeltaH_2 gt DeltaH_3`

C

`DeltaH_3 gt DeltaH_2 gt DeltaH_1 gt DeltaH_4`

D

`DeltaH_2 gt DeltaH_1 gt DeltaH_4 gt DeltaH_3`

Text Solution

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The correct Answer is:
B
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AAKASH SERIES-ALKYL AND ARYL HALIDES-OBJECTIVE EXERCISE - 2B
  1. In the above molecule, the chiral centres are

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  2. Among the following which cannot exhibit optical isomerism

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  3. For the following reactions The correct decreasing order of entha...

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  4. In the following carbocation , H//CH3 that is most likely to migrate t...

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  5. Among the following the strongest nucleophile is

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  6. The correct order of leaving group ability in a nucleophilic substitut...

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  7. The major elimination product 'X' is :

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  8. An internal nuclephilic substitution reaction involves the

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  9. The final organic product is

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  10. Products of reactions (I) and (II) are

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  11. Which among the following on dehalogenation will give trans-alkene ?

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  12. R2CH-underset(X)underset(|)(C )-R2 + ,B^(-) R2C = CR' + H - B + X^(-)....

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  13. CH3-underset(Br)underst(|)(CH)-CH2-CH3 overset(Me3COK)(rarr)X. The pro...

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  14. CF3-CHCl2 overset(C2H5O^(-))(rarr)CF3 - Coverset(o.)(C )l2 rarr. The c...

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  15. El(CB) reaction is given by which of the following A) CF3 -CHCl2 B...

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  16. Which of the following singlet carbene is most stable

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  17. Which one of the following halides is most reactive for SN2 reaction

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  18. Which of the following solvent useful to carry SN2 reaction ?

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  19. Correct statement regarding SN2 reaction is A) rate = K[substrate][N...

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  20. Optically pure 2(S)-butanol is subjected to the following reaction 2 (...

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