T.N.T. is chemically known as:

2,4,6-trinitrotoluene

The correct answer is option 2. 2,4,6-Trinitrotoluene.

T.N.T. (Trinitrotoluene) is chemically known as 2,4,6-trinitrotoluene.

2,4,6-Trinitrotoluene is an organic compound commonly known as TNT. It is a pale yellow solid that is widely used as an explosive material. The compound is derived from toluene by the nitration process, where three nitro groups \((NO_2)\) are attached to the carbon atoms in the 2nd, 4th, and 6th positions on the benzene ring.

The structure of TNT is as follows:

A benzene ring (aromatic ring) with a methyl group \((CH_3)\) attached to one carbon (toluene). Nitro groups \((NO_2)\) attached to the 2nd, 4th, and 6th positions of the benzene ring.

The chemical formula for TNT is C₇H₅N₃O₆.

Other Options:

Trinitrotoluene: This term is more general and does not specify the exact positions of the nitro groups on the benzene ring.

o-Nitrotoluene: This refers to the nitro group attached to the 2nd position relative to the methyl group, but with only one nitro group.

m-Nitrotoluene: This refers to the nitro group attached to the 3rd position relative to the methyl group, again with only one nitro group.

Conclusion:

The correct chemical name for TNT is 2,4,6-trinitrotoluene.