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Select the most stable intermediate....

Select the most stable intermediate.

A

B

C

D

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A
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Consider the following conformations of 3-Aminopropanal, amongst the given conformations (P, Q, R, S) one of them is most stable. The correct statements for the above is/are : (I) H-bonding is present in the most stable conformer (II) Gauche conformation is the most stable conformer (III) Anti conformation is the most stable conformer (IV) larger groups being separated by maximum distance in the conformer

Consider the following conformations of 3-Aminopropanal, amongst the given conformations (P, Q, R, S) one of them is most stable. The correct statements for the above is/are (I) H-bonding is present in the most stable conformer (II) Gauche conformation is the most stable conformer (III) Anti conformation is the most stable conformer (IV) larger groups being separated by maximum distance in the conformer

The products of bond breaking, shown below, are not stable, and cannot be isolated for prolonged study. Such species are referred to as reactive intermediate, and are belived to be transient intermediates in many reactions. The general structures and names of four such intermediates are, Charged Intermediates Uncharged Intermediates Carbocations (called carbonium ions in the older literature) are electrophiles and carbananions are nucleophiles. Carbenes have only a valence shell sextet of electrons and are therefore electron deficient. In this sense they are elecrophiles, but the non-bonding electron pair also gives carbenes nucleophilic character. As a rule, the electrophilic character dominates carbene reactivity. Carbon radicals have only seven valence electrons, and may be considered electron deficient, however, they do not in general bond to nucleophilic electron pair, so their chemistry exhibits differences from that of conventional electrophiles. Radical intermediates are often called free radicals. Intermediates are in general stabilised with conjugation, electron donating and electron with drawing groups. Which of the following carbo cations is more stable?

How many of the following statements are correct? 1) The most stable conformer of cis-1, 3-cyclohexanediol is chair form. 2) Cis- 1, 3- cyclohexanediol is more stable than trans -1, 3-cyclohexanediol. 3) In Cis 1, 3-cyclohexanediol both the OH groups occupy equitorial positions. 4) The most stable conformer of trans -1, 4-cyclohexanediol is chair form. 5) The most stable conformer of cis-1, 4-cyclohexanediol is boat conformer.

AAKASH SERIES-ELECTRONIC EFFECTS AND REACTION INTERMEDIATES-ADDITIONAL PRACTICE EXERCISE (LEVEL - I (MAIN) Straight Objective Type Questions)
  1. Which order is correct regarding stability of intermediates. (I) CH(...

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  2. Select the most stable intermediate.

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  3. These are three canonical structures of napthalene. Examine them and f...

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  4. CH(2)=underset((I))(CH)-CH=CH-CH(3) is more stable than CH(3)-underset...

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  5. In which of the following molecules pi- electron density in ring is ma...

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  6. In which of the following molecules pi- electron density in ring is mi...

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  7. Which of the following compound is non aromatic?

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  8. Among the following molecules, the correct order of C - C bond length ...

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  9. C(1)-C(2) bond is shortest in

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  10. Which of the following has the longest C - O bond ?

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  11. Among these compounds, the correct order of C - N bond lengths is

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  12. {:("(I) "CH(3)O-CH=CH-NO(2), "(II) "CH(2)=CH-NO(2)), ("(III) "CH(2)=CH...

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  13. Select the least acidic compound.

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  14. Write correct order of acidic strength of following compounds

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  15. Arrange the given phenols in their decreasing order of acidity S...

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  16. Which one of the following is the most acidic?

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  17. Which one of the following phenols will show the highest acidity?

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  18. Which of the following is the weakest acid?

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  19. The correct pKa order of the following acids is

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  20. Which of the following compound is having the highest P^(ka) value

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