Methoxymethane (dimethyl ether) has two equivalent methyl groups (\(CH_3\)) attached to the same oxygen atom. Since all hydrogen atoms in the molecule are chemically equivalent, the 1H NMR spectrum shows only one peak.
| Group I | Group II |
| P) NaCl | 1) Coordination bond |
| Q) $H_2$ | 2) Polar covalent bond |
| R) $Pd-P$ bond in $Pd(PPh_3)_4 | 3) Covalent bond |
| S) $C-Cl$ bond in $CH_3Cl $ | 4) Ionic bond |

