The hydration of 1-p-menthene [1], 3-p-menthene [2], 1, 8-p-menthadiene [3], isoprene [4] mycrene [5], dihydromycrene [6], longifolene C7J and p-caryophyllene C8D with mono-, di- and trichloroacetic acids in the presence of synthetic zeolites (A-3, A-4, A-5, F-9 and TSZ-301) was investigated. The hydration of[1], [2] and [3]gave cis-1-p-menthanol [1 0 ], trans-4-p-menthanol [13] and a-terpineol [ 14 ], respectively as a main product with high conversion (89-400%, at best) and high selectivity. Hydration of C 4 J gave geraniol [15] as a major product. Linalool C. /8 J and myrcenol [19] were obtained as major two products from C 5 J. Under particular conditions, the [18]/[19] ratio was 57: 28 or 46: 42. Dihydromyrcenol [20]was obtained from [6] as a main product, amounting to 80% of the hydration products under the best conditions. Longicamphene hydrate [21]was obtained in high selectivity (86% and 92%) from [7]. β-Caryophyllene alcohol [24] was obtained from [8] as a main product, amounting to 84% of the hydration products under the best conditions.