Question

5. Briefly explain the difference between substitution mechanisms SN, and SN2 and elimination mechanisms E, and E2. [4 marks]

Answer 1

Answers Question no 5 SN1 1. The rate of reaction is unimolecular. SN2 1. The rate of reaction is bimolecular 2. No carbocation is formed during the reaction 2. Carbocation is formed as an intermediate part of the reaction. 3. It is a two step mechanism 3. It is only a one step mechanism 4. There is no partial bond formed with the carbon during this reaction 4. Carbon forms a partial bond with the nucleophile and the leaving group 5. There are many steps in this reaction which start with the removal of the group while attacking the nucleophile. 5. The process takes place in only one cycle, with a single intermediate stage E1 E2 1.It is unimolecular reaction. 1.It is bimolecular reaction. 2.Here carbocation formation taking place 2. No carbocation formation 3.No need strong base 3. It requires strong base 4. No need stereochemistry 4.Leaving group must be anti to hydrogen removal.

Question No 1 Indication of hybridzation Sp2 Η Sp2 1 NO H3C1 I- CSC Sp2 Sp2 Question No 2 In this option a only having structural isomer.(Cl position changed) IUPAC name of the given compounds CI 1,3-dichlorobenzene 1,4-dichlorobenzene СН3 H CH3 co- -CH2 Нас H3C - H butane isopentane or 2-Methylbutane