Benzene diazonium salt on reduction with X yields benzene. X is

Correct IUPAC name of ortho-toluidine is

Nitrosomines&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mfenced><mrow><msub><mi mathvariant="normal">R</mi><mn>2</mn></msub><mo>&nbsp;</mo><mi mathvariant="normal">N</mi><mo>-</mo><mi mathvariant="normal">N</mi><mo>=</mo><mi mathvariant="normal">O</mi></mrow></mfenced></math>&nbsp;are soluble in water. On heating with conc.&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi mathvariant="normal">H</mi><mn>2</mn></msub><msub><mi>SO</mi><mn>4</mn></msub></math>, they give secondary amines the reaction is called.

Four numbers are in arithmetic progresion. the sum of first and last terms is 8 and the product of both middle terms is 15. The least number of the series is&nbsp; &nbsp;

Aniline is treated with&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>Br</mi><mn>2</mn></msub></math>&nbsp;water at room temperature to give the following product

Benzene diazonium salt on reduction with X yields benzene. X is

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