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JEE Chemistry Solved Question Paper 2014

Multiple Choice Questions

31.

Among the following structures the one which is not a resonating structure of others is

32.

Among the following compounds, the one(s) that gives (give) effervescence with aqueous NaHCO₃ solution is (are)

(CH₃CO)₂ O CH₃COOH PhOH CH₃COCHO

I II III IV

I and II
I and III
Only II
I and IV

33.

The 4th higher homologue of ethane is

butane
pentane
hexane
heptane

34.

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

N₂O
CO₂
CH₄
O₂

35.

Metal ion responsible for the Minimata disease is

Co²⁺
Hg²⁺
Cu²⁺
Zn²⁺

36.
The most likely protonation site in the following molecule is

C-1

C-2

C-3

C-6

C-1

Addition of a proton at C¹ results in the formation of tropylium carbocation (an aromatic species with more stability due to delocalisation of $π$ electrons), thus, it is the most reactive site towards protonation. Addition of proton at any other carbon atom, interupt in the delocaiisation of $π$ electrons by disturbing planarity of molecules and hence, makes it less stable. Thus, these all are less reactive towards protonation.

37.

The order of decreasing ease of abstraction of hydrogen atoms in the following molecules

H_a > H_b > H_c
H_a> H_c > H_b
H_b > H_a> H_c
H_c > H_b > H_a

38.

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
Xis a D-sugar and Y is an L-sugar

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