Assuming you meant for shorts - Bacardi, Brandy, Gin, Malibu, Rum, Vodka & Whisky are all 4 syns. Peach Schnapps is 4.5 and Southern Comfort & Tequila are 5.5 - all for 35 mls.
Extra dry Cinzano or Martini are both 2.5 syns for 50 ml but obvioulsy they may not be your poison.