Chemistry informtion about 2-Nitrobenzyl Chloride (CAS NO.612-23-7) is:
IUPAC Name: 1-(Chloromethyl)-2-Nitrobenzene
Synonyms: 2-Nitrobenzyl Chloride ; A-Chloro-O-Nitrotoluene ; Akos Bbs-00004020 ; Alpha-Chloro-O-Nitrotoluene ; Alpha-Chloro-2-Nitrotoluene ; O-Nitrobenzyl Chloride ; 1-(Chloromethyl) -2-Nitrobenzene ; 1-(Chloromethyl)-2-Nitro-Benzen
MF: C₇H₆ClNO₂
MW: 171.58
EINECS: 210-300-5
Melting Point: 46-48 °C(lit.)
Density: 1.33 g/cm³
Flash Point: 112.7 °C
Boiling Point: 269 °C at 760 mmHg
Vapour Pressure: 0.0123 mmHg at 25°C 
Enthalpy of Vaporization: 48.67 kJ/mol 
BRN: 388396
Stability: Stable. Incompatible with bases, moisture, acohols, oxidizing agents, amines. Corrodes steel.
Following is the molecular structure of 2-Nitrobenzyl Chloride (CAS NO.612-23-7) is:

Mutation data reported. Thermal decomposition is highly exothermic with much gas evolution. When heated to decomposition it emits very toxic fumes of Cl⁻ and NO_x. See also p-NITROBENZYL CHLORIDE and NITRO COMPOUNDS OF AROMATIC HYDROCARBONS.
Hazard Codes:
C
Risk Statements:
R34:Causes burns.
R36:Irritating to eyes.
Safety Statements:
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection.
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) 
S27:Take off immediately all contaminated clothing.
RIDADR: UN 3261 8/PG 2
WGK Germany: 3
RTECS: XS9092000
F: 
F 19: Lachrymator.
F 21: Sensitive to humidity.
HazardClass: 8
PackingGroup: II

2-Nitrobenzyl Chloride (CAS NO.612-23-7) is a pale yellow crystals.It is insoluble in water and is thermally unstable. A halogenated aromatic nitro compound. Aromatic nitro compounds range from slight to strong oxidizing agents. If mixed with reducing agents, including hydrides, sulfides and nitrides, they may begin a vigorous reaction that culminates in a detonation. The aromatic nitro compounds may explode in the presence of a base such as sodium hydroxide or potassium hydroxide even in the presence of water or organic solvents. The explosive tendencies of aromatic nitro compounds are increased by the presence of multiple nitro groups. It is toxic an lachrymator. It can causes irritation on contact. Hazardous decomposition products. Mutagen. And it is combustible.