Molecular structure of 5-Bromo-1-pentene (CAS NO.1119-51-3) is:

Product Name: 5-Bromo-1-pentene
CAS Registry Number: 1119-51-3
IUPAC Name: 5-bromopent-1-ene
Molecular Formula: C₅H₉Br
Molar mass: 149.029 g/mol
EINECS: 214-281-4 
Surface Tension: 27 dyne/cm
Density: 1.248 g/cm³
Flash Point: 31 °C
Enthalpy of Vaporization: 34.9 kJ/mol
Boiling Point: 126.2 °C at 760 mmHg
Vapour Pressure: 14.3 mmHg at 25°C
Refractive index: n20/D 1.463(lit.) 
Product Categories: omega-Functional Alkanols, Carboxylic Acids, Amines & Halides;omega-Unsaturated Halides;Alkenyl;Halogenated Hydrocarbons;Organic Building Blocks

Safty information about 5-Bromo-1-pentene (CAS NO.1119-51-3) is:
Hazard Codes: Xi
Risk Statements: 10-36/37/38 
R10:Flammable. 
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 26-24/25-16 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S24/25:Avoid contact with skin and eyes. 
S16:Keep away from sources of ignition.
RIDADR: UN 1993 3/PG 3
WGK Germany: 3
F: 8
HazardClass: 3
PackingGroup: II
HS Code: 29033036

 5-Bromo-1-pentene , its cas register number is 1119-51-3. It also can be called 1-Bromo-4-pentene ; 5-Bromopent-1-ene ; 1-Pentene, 5-bromo- .It is a clear colorless to yellow liquid.