Electrophilic addition reactions proceed in two steps. The first step involves the addition of an electrophile. The major intermediate formed in the first step is -
?
1. carbanion
2. carbocation
3. carbocation
4. carbanion
The addition of HCl to an alkene proceeds in two steps. The first step is the attack of H+ ion on the double bond portion. The same can be shown as-
1. | 2. | ||
3. | 4. | All of these are possible |
Electrophiles are electron-seeking species. Which of the following groups contain only electrophiles?
(a). BF3, NH3, H2O
(b). AlCl3, SO3 , NO2+
(c). NO2+ , CH3+, CH3-C+=O
(d) C2H5-, , C2H5+
Choose the correct option:
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
A nucleophile is a species that should have
(a) A pair of electrons to donate
(b) Positive charge
(c) Negative charge
(d) Electron-deficient species
Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, c)