Primary alcohols can be dehydrated to produce ethers. The correct option is A, ethers.
Dehydration reaction are those reactions in which there is loss of water. When aldehyde reacts with sulfuric acid, it forms alkenes with loss of water, in excess of acids.
When aldehyde reacts with acids, with excess of aldehyde, forms ether.
Thus, the correct option is A) ethers.
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