Chlorofluorobenzene liquid crystal compound, liquid crystal composition, and liquid crystal display device

A liquid crystal compound represented by one of formulas (b-1) to (d-1):

• wherein Ra1 and Rb1 are independently linear alkyl having 1 to 10 carbons, provided that in the alkyl, —CH2— may be replaced by —O—, —(CH2)2— may be replaced by —CH═CH;
• rings A1, A2 and B are independently trans-1,4-cyclohexylene or 1,4-phenylene;
• Z11, Z12, Z2 and Z3 are independently a single bond or alkylene having 2 or 4 carbons, provided that in the alkylene, —CH2— may be replaced by —O— and —(CH2)2— may be replaced by —CH═CH—;
• and X1 is chlorine, and X2 is fluorine, provided that:
• in a case where:
• in formula (b-1), rings A1 and B are trans-1,4-cyclohexylene, Z11 is a single bond, and Z2 is —CH2O—, and
• in formula (d-1), rings A1, A2 and B are trans-1,4-cyclohexylene, Z11 and Z12 are a single bond, and Z2 is a single bond or —CH2O—,
• Rb1 is one of linear alkoxy having 1 to 9 carbons, linear alkoxyalkyl having 2 to 9 carbons, linear alkenyl having 2 to 10 carbons, and linear alkenyloxy having 2 to 9 carbons, and
• in formula (b-1), rings A1 and B are trans-1,4-cyclohexylene, Z11 is —CH2O—, and Z2 is a single bond,
• Rb1 is one of linear alkyl having 1 to 10 carbons, linear alkenyl having 2 to 10 carbons, and linear alkenyloxy having 2 to 9 carbons.

A liquid crystal compound represented by one of formulas (b-2) to (d-2):

• wherein Ra1 and Rb1 is linear alkyl having 1 to 10 carbons, provided that in the alkyl, —CH2— may be replaced by —O—, —(CH2)2— may be replaced by —CH═CH—;
• rings A1, A2 and B are independently trans-1,4-cyclohexylene or 1,4-phenylene;
• Z11 is a single bond or —(CH2)2—, Z12, Z2 and Z3 are independently a single bond or alkylene having 2 or 4 carbons, provided that in the alkylene, —CH2— may be replaced by —O— and —(CH2)2— may be replaced by —CH═CH—;
• and X1 is chlorine, and X2 is florine, provided that:
• in a case where:
• in formula (b-2), rings A1 and B are trans-1,4-cyclohexylene, Z11 is a single bond, and Z2 is —CH2O—, and
• in formula (d-2), rings A1, A2 and B are trans-1,4-cyclohexylene, Z11 and Z12 are a single bond, and Z2 is a single bond or —CH2O—,
• Rb1 is one of linear alkoxy having 1 to 9 carbons, linear alkoxyalkyl having 2 to 9 carbons, linear alkenyl having 2 to 10 carbons, and linear alkenyloxy having 2 to 9 carbons.