To a mixture of conc. HNO3 and conc. H2SO4, benzene was added. This mixture was heated for 30 minutes at 100oC. The main product is:

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77

Organic Chemistry MCQ with Answers

77) To a mixture of conc. HNO₃ and conc. H₂SO₄, benzene was added. This mixture was heated for 30 minutes at 100^oC. The main product is:

C₆H₅NO₂

C₆H₅SO₃H

m−dinitrobenzene

m−nitrobenzene sulphonic acid

Answer is:

m−dinitrobenzene

Organic Chemistry MCQ with Answers

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78) An unknown compound A has the formula C₄H₆. When A is treated with excess of Br₂, a new compound B is formed with formula C₄H₆Br₄. A also gives white ppt. with Tollen′s reagent. The compound A may be:

But−1−yne

But−2−yne

But−1−ene

But−2−ene

Answer is:

But−1−yne

Explanation:

The data suggests that compound A is a terminal alkyne.

79) In the presence of peroxide, hydrogen chloride and hydrogen iodide do not give anti Markownikov′s addition to alkenes because:

Both are highly ionic

One is oxidising and one is reducing

One of the steps is endothermic in both the cases

All the steps are exothermic in both the cases

Answer is:

One of the steps is endothermic in both the cases

80) Xylene on treatment with Br₂⁄FeBr₃ gives only one product. Xylene was:

o−xylene

m−xylene

p−xylene

Not possible

Answer is:

p−xylene

Explanation:

In p−xylene, all the positions are equivalent and give only one monosubstituted product.

81) The reduction of an alkyne to alkene using lithium metal in liquid ammonia as solvent results in:

cis addition of hydrogen atoms

trans addition of hydrogen atoms

Both cis and trans additions of hydrogen atoms. The relative amounts of the two depend on temperature.

Both cis and trans additions of hydrogen atoms. The relative amounts depend on the nature of alkynes.

Answer is:

trans addition of hydrogen atoms

Organic Chemistry MCQ with Answers

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77) To a mixture of conc. HNO3 and conc. H2SO4, benzene was added. This mixture was heated for 30 minutes at 100oC. The main product is:

m−dinitrobenzene

Organic Chemistry MCQ with Answers

Related Organic Chemistry MCQ with Answers

78) An unknown compound A has the formula C4H6. When A is treated with excess of Br2, a new compound B is formed with formula C4H6Br4. A also gives white ppt. with Tollen′s reagent. The compound A may be:

But−1−yne

79) In the presence of peroxide, hydrogen chloride and hydrogen iodide do not give anti Markownikov′s addition to alkenes because:

One of the steps is endothermic in both the cases

80) Xylene on treatment with Br2⁄FeBr3 gives only one product. Xylene was:

p−xylene

81) The reduction of an alkyne to alkene using lithium metal in liquid ammonia as solvent results in:

trans addition of hydrogen atoms

Organic Chemistry MCQ with Answers

77) To a mixture of conc. HNO₃ and conc. H₂SO₄, benzene was added. This mixture was heated for 30 minutes at 100^oC. The main product is:

78) An unknown compound A has the formula C₄H₆. When A is treated with excess of Br₂, a new compound B is formed with formula C₄H₆Br₄. A also gives white ppt. with Tollen′s reagent. The compound A may be:

80) Xylene on treatment with Br₂⁄FeBr₃ gives only one product. Xylene was: