Involved in the production of citral, a mixture of geranial and neral with a strong lemony scent. Reversibly oxidizes geraniol to produce geranial at half the efficiency compared with its activity with cinnamyl alcohol. Does not use nerol and neral as substrates. (E)-cinnamyl alcohol + NADP(+) = (E)-cinnamaldehyde + H(+) + NADPH Binds 2 Zn(2+) ions per subunit. 60% inhibition by 5 mM Ca(+), Mg(+) or Cu(+). Optimum pH is 8.9. Active from pH 8.5 to 9.4. Aromatic compound metabolism; phenylpropanoid biosynthesis. Homodimer. Expressed in leaves, mainly in peltate glands. Belongs to the zinc-containing alcohol dehydrogenase family.