The correct order of decreasing stability of the following cations is:
I | \( ~~~~~~~~~~~~\oplus\\ CH_3 - CH-CH_3\) |
II | \( ~~~~~~~~~~~~\oplus\\
CH_3 - CH-OCH_3\) |
III | \( ~~~~~~~~~~~~\oplus\\
CH_3 - CH-CH_2- OCH_3\) |
1. | II>I>III | 2. | I>II>III |
3. | II<I<III | 4. | I<II<III |
Which of the following carbon marked with asterisk is expected to have greatest positive charge?
1.
2.
3.
4.
The most stable carboxylate ion among the following is-
1.
2.
3.
4.
Match the ions given in Column I with their nature-given in Column II.
Column I |
Column II |
A. |
1. Stable due to resonance |
B. |
2. Destabilised due to inductive effect |
C. |
3. Stabilised by hyperconjugation. |
D. |
4. A secondary carbocation |
Codes
Options: | A | B | C | D |
1. | 1,2 | 2 | 2 | 3,4 |
2. | 1 | 2,4 | 3 | 4 |
3. | 1 | 4 | 3 | 2 |
4. | 4 | 1 | 3 | 2 |
Hyperconjugation involves delocalization of -
a. | Electrons of carbon-hydrogen bond of an alkyl group directly attached to an atom of unsaturated system. |
b. | Electrons of carbon-hydrogen bond of alkyl group directly attached to the positively charged carbon atom. |
c. | -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)