Question

[Figure]

Answer 1

Benzaldehyde

Answer 2

The reaction sequence is as follows:

1. 1-bromopropane dimerizes via Wurtz reaction to form n-hexane.
2. n-hexane cyclizes and dehydrogenates (aromatization) to yield benzene.
3. Benzene undergoes formylation via Gattermann-Koch reaction to produce benzaldehyde.