Involved in the production of citral, a mixture of geranial and neral with a strong lemony scent. Reversibly oxidizes geraniol and nerol in equal efficiency. Also active, although at a lower efficiency, with cinnamyl alcohol. (2E)-geraniol + NADP(+) = (2E)-geranial + H(+) + NADPH 66% inhibition by 5 mM Zn(2+). Optimum pH is 9.5. Active from pH 8.5 to 10.0. Expressed in leaves, with a very low expression in peltate glands. Belongs to the zinc-containing alcohol dehydrogenase family.