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  • 1(current)
Q. No.

The correct order of decreasing stability of the following carbocations is:

I \( \begin{aligned} &~~~~~~~~~~~~\oplus\\ & CH_3 - CH-CH_3 \end{aligned}\)
II \( \begin{aligned} &~~~~~~~~~~~~\oplus\\ & CH_3 - CH-OCH_3\end{aligned}\)
III \( \begin{aligned} & ~~~~~~~~~~~~\oplus\\ &CH_3 - CH-CH_2- OCH_3\end{aligned}\)
 
1. II > I > III 2. I > II > III
3. II < I < III 4. I < II < III
Subtopic:  Electron Displacement Effects |
 60%
Level 2: 60%+
Hints

Which of the following carbon marked with asterisk is expected to have greatest positive charge?

1. *CH3-CH2-Cl 2. *CH3-CH2-Mg+Cl-
3. *CH3-CH2-Br 4. *CH3-CH2-CH3
Subtopic:  Electron Displacement Effects |
 58%
Level 3: 35%-60%
Hints

Which carboxylate ion among the following is the most stable?

1. 2.
3. 4.

Subtopic:  Electron Displacement Effects |
 81%
Level 1: 80%+
Hints
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Match the ions given in Column I with their nature given in Column II.

Column I
(Ions)
 		 Column II
(Corresponding nature)
 
A. I. Stable due to resonance
B. II. Destabilised due to inductive effect
C. III. Stabilised by hyperconjugation
D. IV. A secondary carbocation

Codes:

Options:  A   B   C   D 
1. I,II  II II III,IV
2. I II,IV  III  IV
3. I  IV III  II
4. IV I III II

Subtopic:  Electron Displacement Effects | Reaction Intermediates ; Preparation & Properties |
 78%
Level 2: 60%+
Hints

Arrange the following carbanions in order of their decreasing stability:

A. \(\mathrm{H}_3 \mathrm{C}-\mathrm{C} \equiv \mathrm{C}^{-}\)
B. \(\mathrm{H}-\mathrm{C} \equiv \mathrm{C}^{-}\)
C. \(\mathrm{H}_3 \mathrm{C}-\mathrm{{C}H_2^-}\)

 
1. A > B > C 2. B > A > C
3. C > B > A 4. C > A > B
Subtopic:  Electron Displacement Effects |
 72%
Level 2: 60%+
Hints
Hyperconjugation involves the delocalization of:
a. Electrons of carbon-hydrogen \(\sigma \text -\) bond of an alkyl group directly attached to an atom of unsaturated system.
b. Electrons of carbon-hydrogen \(\sigma \text -\) bond of alkyl group directly attached to the positively charged carbon atom.
c. \(\pi \text -\) electrons of carbon-carbon bond.
d. Lone pair of electrons.

Choose the correct option:

1. (a, b) 2. (b, c)
3. (c, d) 4. (a, c)
Subtopic:  Electron Displacement Effects |
 69%
Level 2: 60%+
Hints
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