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Which of the following structures repres...

Which of the following structures represents a colourless substance

A

`C_6H_5-N=underset(O)underset(N)-C_6H_5`

B

`C_6H_5 -N=N-C_6H_5`

C

`C_6H_5 -NH-NH-C_6H_5`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
C
The azo group (-N = N-) is a chromophore but the group -NH - NH - is not,
Hence `C_6 H_5 -NH-NH-C_6H_5` is a colourless compound.
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