Molecular structure of 2-Fluorophenylacetylene (CAS NO.766-49-4) is:

Product Name: 2-Fluorophenylacetylene
CAS Registry Number: 766-49-4
Molecular Formula: C₈H₅F
Molecular Weight: 120.12
Refractive index: 1.524-1.527 
Storage temp.: Refrigerator (+4 °C)
Index of Refraction: 1.515 
Molar Refractivity: 33.92 cm³ 
Molar Volume: 112.3 cm³
Surface Tension: 33.5 dyne/cm 
Density: 1.06 g/cm³ 
Flash Point: 26.3 °C 
Enthalpy of Vaporization: 37.03 kJ/mol 
Boiling Point: 149.3 °C at 760 mmHg 
Vapour Pressure: 5.15 mmHg at 25°C 
Product Categories: Acetylenes;Acetylenic Hydrocarbons having Benzene Ring;Alkynyl;Halogenated Hydrocarbons;Organic Building Blocks
SMILES: Fc1ccccc1C#C 
InChI: InChI=1/C8H5F/c1-2-7-5-3-4-6-8(7)9/h1,3-6H 
InChIKey: YFPQIXUNBPQKQR-UHFFFAOYAA 
Std. InChI: InChI=1S/C8H5F/c1-2-7-5-3-4-6-8(7)9/h1,3-6H
Std. InChIKey: YFPQIXUNBPQKQR-UHFFFAOYSA-N

Safty information about 2-Fluorophenylacetylene (CAS NO.766-49-4) is:
Hazard Codes: Xi
Risk Statements: 36/37/38-10 
R36/37/38:Irritating to eyes, respiratory system and skin. 
R10:Flammable.
Safety Statements: 37/39-26-16-36 
S37/39:Wear suitable gloves and eye/face protection. 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S16:Keep away from sources of ignition. 
S36:Wear suitable protective clothing.
RIDADR: UN 1993 3/PG 3
Hazard Note: Irritant

 2-Fluorophenylacetylene , its cas register number is 766-49-4. It also can be called 1-Ethynyl-2-fluorobenzene ; Benzene,1-ethynyl-2-fluoro- .It is a clear yellow to brownish liquid.