Subject

Chemistry

Class

NEET Class 12

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NEET Chemistry Solved Question Paper 2017

Multiple Choice Questions

21.
Which of the following compounds is aromatic in nature?

Among all the given options, option a is correct.

It is due to the presence of (4n + 2) $π$ e^- it follows Huckel's rule and therefore, it is aromatic.

In option b, due to te presence of extra lone pair of electrons, total e^- comes out to be 4 $π$ e^-. Thus, it is anti-aromatic.

In option c, although it is cyclic and has conjugated 8 $π$ e^- but Huckel's (4n + 2) $π$ rule is not followed and also ring is not planar. Hence, it is non- aromatic.

In option d, it has 6 $π$ e^- in conjugation but not in the ring, hence it is non - aromatic.

22.

H₂O₂ can be obtained when following reacts with H₂SO₄ except with

BaO₂
PbO₂
Na₂O₂
SrO₂

23.

Which of the following is an electrophile?

CCl₂
CH $_{3}^{-}$
H₂O
NH₃

24.

What is the correct order of basicity among the following compounds ?

II > I > III > IV
I > II > III > IV
III > I > II > IV
I > III > II > IV

25.

The colourless species is

VCl₃
VOSO₄
Na₃VO₄
[V(H₂O)₆]SO₄.H₂O

26.

Select the correct options from the following :

Graphene is an atomic layer of graphite
Graphene is an atomic layer composed of sp²-hybridised carbon.
Chemical bonds in graphite are similar in strength to that of diamond.
All of these.

27.

Arrange the following nucleophiles in the decreasing order of nucleophilicity :

(A) CH₃COO^-

(B) CH₃O^-

(D)

C, B, A, D
A, B, C, D
C, C, B, A
B, C, A, D

28.

Assertion : The carbonate of lithium decomposes easily on heating to form lithium oxide and CO₂.

Reason : Lithium being very small in size polarises large carbonate ion leading to the formation of more stable Li₂O and CO₂.

If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false
If both assertion and reason are false

29.

Assertion : Thiophene present in commercial benzene as an impurity can be removed by shaking the mixture with cold concentrated H₂SO₄.

Reason : Thiophene is a heterocyclic aromatic compound.

If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.