**Target Conversion:**
Convert an aldehyde to a primary amine with an additional carbon.
**Step-by-Step Analysis:**
**Option 1:**
1. \( \mathrm{H}_{2}\mathrm{NCH}_{2}\mathrm{MgBr} \)
2. \( \mathrm{H}_{3}\mathrm{O}^{+} \)
- This sequence involves a Grignard
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