Statement I: Reaction of NH3 with dimethyl either fails to give methyl amine
Statement II: −OCH3 is a good leaving group
Answer & explanation
Correct answer: option 3
The answer is 3. Statement I is correct but statement II is false.
Statement I is correct because the reaction of NH3 with dimethyl ether does not give methyl amine. This is because the −OCH3 group is a poor leaving group. A poor leaving group is a group that is difficult to remove from a molecule. In the case of dimethyl ether, the −OCH3 group is attached to a carbon atom by a single bond. This bond is relatively weak, and it is difficult for the −OCH3 group to break away from the carbon atom.
Statement II is false because −OCH3 is not a good leaving group. A good leaving group is a group that is easily removed from a molecule. In the case of dimethyl ether, the −OCH3 group is not easily removed because it is attached to a carbon atom by a single bond.
Therefore, statement I is correct but statement II is false. The correct explanation for why the reaction of NH3 with dimethyl ether does not give methyl amine is that the −OCH3 group is a poor leaving group.