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) \(\mathrm {BF_3, NH_3, H_2O} \)
(b) \(\mathrm {AlCl_3, SO_3 , NO_2^+} \)
(c) \(\mathrm {NO_2^+ , CH_3^+, CH_3-C^+\text=O} \)
(d) \(\mathrm {C_2H_5^-,H_3C -\dot{C}H_2,C_2H_5^+} \)
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)