Organic Chemistry Test

Result

Organic Chemistry Test - 46

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Weekly Quiz Competition

Question 1
4 / -1

Heat of hydrogenation of benzene is 51 kcal/mol and its resonance energy is 36 kcal/mol. Then the heats of hydrogenation of cyclohexadiene and cyclohexene per mole respectively are

A
58 kcal, 58 kcal

B
25 kcal, 29 kcal

C
29 kcal, 58 kcal

D
58 kcal, 29 kcal
Question 2
4 / -1

Which of the following statements is incorrect ?

A
In pyrrole, the lone pair of electrons on N- atom is involved in aromatic sextet formation

B
In pyridine, the lone pair of electrons on N is not involved in aromatic sextet formation

C
Delocalization of π − electrons does not always lead to stabilization

D
Delocalization of π − electrons always leads to stabilization
Question 3
4 / -1

Which of the following does not represent the correct order of –I-effect of the substituent ?

A
I - < Cl - < Br - < F-

B
RS - < R₂N - < RO -

C

D
Question 4
4 / -1

A
I and IV

B
I and III

C
II and III

D
II amd IV
Question 5
4 / -1

A
I > II > III

B
II > III > I

C
III > I > II

D
II > I > III

Solution
Question 6
4 / -1

A
(i) (ii) and (iii)

B
(i) (ii) and (iv

C
(ii) and (iii)

D
(iii) and (iv)

Solution
Question 7
4 / -1

A solution of (+)-2-chloro-2phenylethane in toluene racemises slowly in the presence of a small amount of SbCl5, due to the formation of

A
Carbanion

B
Carbene

C
Free radical

D
Carbocation
Question 8
4 / -1

If two compounds have the same empirical formula but different molecular formulae, they must have

A
different percentage composition

B
different molecular weights

C
same viscosity

D
same vapour density
Question 9
4 / -1

Soda-lime test is used to detect the following element in an organic compound?

A
C

B
H

C
N

D
S
Question 10
4 / -1

Lassaigne’s test is used in qualitative analysis to detect

A
Nitrogen

B
Sulphur

C
Chlorine

D
All of these