The arrangement in decreasing order of stability of H3, H5,(CH3)2H and (CH3)3 free radicals is-
1. H3 > H5 > (CH3)2H > (CH3)3
2. (CH3)3 > (CH3)2H > H5 > H3
3. H5 > H3 > (CH3)2H > (CH3)3
4. (CH3)3 > (CH3)2H > H3 >H5
The species that contains only three pairs of electrons among the following is-
1. | Carbocation | 2. | Carbanion |
3. | Free radical | 4. | None of the above |
H2C = O behaves as:
1. Nucleophile
2. Electrophile
3. Both (1) and (2)
4. None of the above
Electrophiles are:
1. electron loving species
2. electron hating species
3. nucleus loving reagents
4. nucleus hating reagents
Nucleophiles are:
1. electron loving
2. electron hating
3. nucleus loving
4. nucleus hating
The sigma bond energy of C-H bond in C2H6 is:
(1) 99 kcal
(2) 140 kcal
(3) 200 kcal
(4) 60 kcal
Which of the following is strongest nucleophile?
1. Br-
2.
3.
4.
In hyperconjugation, the atom involved is:
1. βΗ atom
2. α-H atom
3. γ-H atom
4. All of these
The stability of 2,3-dimethyl but-2-ene is more than 2-butene. This can be explained in terms of:
1. resonance
2. hyperconjugation
3. electromeric effect
4. inductive effect
Who pointed out the concept of hyperconjugation?
(1) Nathan and Baker
(2) Mulliken
(3) Kekule
(4) Kolbe