Subject

Chemistry

Class

NEET Class 12

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NEET Chemistry Solved Question Paper 2014

Multiple Choice Questions

31.

Commercial sample of H₂O₂ is labeled as 10 V. Its % strength is nearly

32.

The 4th higher homologue of ethane is

butane
pentane
hexane
heptane

33.

Among the following, the one which is not a "green house gas", is

N₂O
CO₂
CH₄
O₂

34.

The reagent with which the following reaction is best accomplished is

H₃PO₂
H₃PO₃
H₃PO₄
NaHSO₃

35.

The most likely protonation site in the following molecule is

36.
The order of decreasing ease of abstraction of hydrogen atoms in the following molecule

H_a > H_b > H_c

H_a > H_c > H_b

H_b > H_a > H_c

H_c > H_b > H_a

H_a > H_c > H_b

Abstraction of (H_a) hydrogen atom results in the formation of 3° allylic carbocation whereas abstraction of H_c gives 2° allylic carbocation (which is less stable as compared to former one).

However, abstraction of H_b gives only a 2° carbocation which is less stable as compared to former two. More the stability of generated carbocation, higher is the tendency of abstraction of hydrogen.

Thus, the order of decreasing ease of abstraction of hydrogen atoms from the given molecule is H_a > H_c > H_b.

37.

Among the following statements about the molecules X and Y, the one(s) which correct is (are)

X and Y are diastereomers
X and Y are enantiomers
X and Y are both aldohexoses
X is a D-sugar and Y is an L-sugar

38.

The electronic configuration of Cu is

[Ne] 3s², 3p⁶, 3d⁹, 4s²
[Ne] 3s², 3p⁶, 3d¹⁰, 4s¹
[Ne] 3s², 3p⁶, 3d³, 3d⁹, 4s², 4p⁶
[Ne] 3s², 3p⁶, 3d⁵, 4s², 4p⁴

39.

The rate of a certain reaction is given by, rate = k [H⁺]ⁿ. The rate increases 100 times when the pH changes from 3 to 1. The order (n) of the reaction is