Question

in the figure above, which fatty acids are most likely to be solid at room temperature?
i
ii, iii and iv
ii, iii, iv and v
i and iv

Explanation:

Saturated fatty acids (without double bonds) have higher melting points and are more likely to be solid at room temperature. In the figure, structure I appears to be a saturated fatty acid (no kinks from double bonds). Unsaturated fatty acids (with double bonds, creating kinks) have lower melting points. Structures II - V likely have double bonds (indicated by kinks in the chain).

Answer:

I