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NEET Chemistry Solved Question Paper 2013

Multiple Choice Questions

41.
Nitrobenzene on reaction with conc. HNO₃/H₂SO₄ at 80-100⁰C forms which one of the following products?

1,2-dinitrobenzene

1,3- dinitrobenzene

1,4-dinitrobenzene

1,4-dinitrobenzene

1,3- dinitrobenzene

NO₂ group being electron withdrawing reduces electron density at output positions. Hence, now the meta-position becomes electron rich on which the electrophile (nitronium ion) attacks during nitration.

HNO₃ +H₂SO₄ ---> H₂NO₃⁺ +HSO^-₄ +H₂O +NO₂⁺

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42.

Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating?

-C $identical to$ N
-SO₃H
-COOH
-COOH

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43.

Which of the following compounds will not undergo Friedel -Craft's reaction easily?

Cumene
Xylene
Nitrobenzene
Nitrobenzene

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44.

In the reaction,

HgSO₄/H₂SO₄
Cu₂Cl₂
H₃PO₂ and H₂O
H₃PO₂ and H₂O

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45.

Which is the monomer of neoprene in the following

$CH subscript 2 space equals CH minus straight C identical to CH$
$CH subscript 2 space equals space straight C space minus CH space equals CH subscript 2 space space space space space space space space space space space space space space vertical line space space space space space space space space space space space space space space CH subscript 3$
$CH subscript 2 space equals space straight C space minus CH space equals CH subscript 2 space space space space space space space space space space space space space space vertical line space space space space space space space space space space space space space Cl$
$CH subscript 2 space equals space straight C space minus CH space equals CH subscript 2 space space space space space space space space space space space space space space vertical line space space space space space space space space space space space space space Cl$