Organic Chemistry Some Basic Principles and Techniques Test

Question 1
1 / -0

Which of the following is the correct IUPAC name?

A
3-Ethyl-4, 4-dimethylheptane

B
4,4-Dimethyl-3-ethylheptane

C
5-Ethyl-4, 4-dimethylheptane

D
4,4-Bis(methyl)-3-ethylheptane

Question 2
1 / -0

The IUPAC name for is \(CH_3-\overset{\overset{O}{||}}{C}-CH_2-CH_2-\overset{\overset{O}{||}}{C}-OH\)

A
1-hydroxypentane-1,4-dione

B
1,4-dioxopentanol

C
1-carboxybutan-3-one

D
4-oxopentanoic acid

Question 3
1 / -0

Electronegativity of carbon atoms depends upon their state of hybridization. In which of the following compounds, the carbon marked with asterisk is most electronegative?

A
\(CH_3 - CH_2 -\, ^*CH_2 -CH_3\)

B
\(CH_3 -\, ^*CH = CH - CH_3\)

C
\(CH_3 - CH_1 - C \equiv\, ^*CH\)

D
\(CH_3 - CH_2 - CH =\, ^*CH_2\)

Question 4
1 / -0

Which of the following compounds contain all the carbon atoms in the same hybridization state?

(i) \(H-C\equiv C-C\equiv C-H\)

(ii) \(CH_3-C \equiv C-CH_3\)

(iii) \(CH_2 = C = CH_2\)

(iv) \(CH_2 = CH-CH = CH_2\)

A
(i),(ii)

B
(ii),(iii)

C
(iii),(iv)

D
(i),(iv)

Question 5
1 / -0

In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A): Simple distillation can help in separating a mixture of propan-1-ol (boiling point 97°C) and propanone (boiling point 56°C).

Reason (R): Liquids with a difference of more than 20°C in their boiling points can be separated by simple distillation.

A
Both A and R are correct and R is the correct explanation of A

B
Both A and R are correct but R is not the correct explanation of A

C
Both A and R are not correct

D
A is not correct but R is correct

Question 6

1 / -0

Match the type of mixture of compounds in Column I with the technique of separation/purification given in Column II.

Column I	Column II
(i) Two solids which have different solubility’s in a solvent and which do not undergo reaction when dissolved in it	(a) Steam distillation
(ii) Liquid that decomposes at its boiling point	(b) Fractional distillation
(iii) Steam volatile liquid	(c) Simple distillation
(iv) Two liquids which have boiling points close to each other	(d)Distillation under reduced pressure
(v) Two liquids with large difference in boiling points	(e) Crystallization

(i) → (e) (ii) → (a) (iii) → (d) (iv) → (b) (v) → (c)

(i) → (e) (ii) → (d) (iii) → (b) (iv) → (a) (v) → (c)

(i) → (e) (ii) → (d) (iii) → (a) (iv) → (c) (v) → (b)

(i) → (e) (ii) → (d) (iii) → (a) (iv) → (b) (v) → (c)

Question 7

1 / -0

Match the terms mentioned in Column I with the terms in Column II.

Column I	Column II
(i) Carbocation	(a) Cyclohexane and 1- hexane
(ii) Nucleophile	(b) Conjugation of electrons of C-H bond with empty p-orbital present at adjacent positively charged carbon
(iii) Hyperconjugation	(c) \(sp ^2\) hybridized carbon with empty p-orbital
(iv) Isomers	(d) Ethyne
(v) sp hybridization	(e) Species that can receive a pair of electrons
(vi) Electrophile	(f) Species that can supply a pair of electrons

(i) → (c) (ii) → (b) (iii) → (f) (iv) → (a) (v) → (d) (vi) → (e)

(i) → (c) (ii) → (f) (iii) → (b) (iv) → (e) (v) → (d) (vi) → (a)

(i) → (c) (ii) → (f) (iii) → (b) (iv) → (a) (v) → (d) (vi) → (e)

(i) → (c) (ii) → (f) (iii) → (b) (iv) → (a) (v) → (e) (vi) → (d)

Question 8
1 / -0

In which of the following, functional group isomerism is not possible?

A
Alcohols

B
Aldehydes

C
Alkyl halides

D
Cyanides

Question 9
1 / -0

The fragrance of flowers is due to the presence of some steam volatile organic compounds called essential oils. These are generally insoluble in water at room temperature but are miscible with water vapour in vapour phase. A suitable method for the extraction of these oils from the flowers is:

A
Distillation

B
Crystallization

C
Distillation under reduced pressure

D
Steam distillation

Question 10
1 / -0

During hearing of a court case, the judge suspected that some changes in the documents had been carried out. He asked the forensic department to check the ink used at two different places. According to you which technique can give the best results?

A
Column chromatography

B
Solvent extraction

C
Distillation

D
Thin layer chromatography

Question 11
1 / -0

The principle involved in paper chromatography is

A
Adsorption

B
Partition

C
Solubility

D
Volatility

Question 12
1 / -0

Electrophiles are electron seeking species. Which of the following groups contain only electrophiles?

(i) \(BF_3 , NH_3 , H_2O\)

(ii) \(AlCl_3, SO_3 , NO_2^+\)

(iii) \(NO_2^ + , CH_3^ + , CH_3 -\overset{+}{C} = O\)

(iv) \(C_2H^-_5,\overset{\bullet}{C}_2H_5,C_2H_5^+\)

A
(i),(ii)

B
(ii),(iii)

C
(iii),(iv)

D
(i),(iv)

Question 13
1 / -0

What is the correct order of decreasing stability of the following cations?

I. \(CH_3-\overset{\oplus}{C}H-CH_3\)

II. \(CH_3-\overset{\oplus}{C}H-OCH_3\)

III. \(CH_3-\overset{\oplus}{C}H-CH_2-OCH_3\)

A
II > I > III

B
II > III > I

C
III > I > II

D
I > II > III

Question 14
1 / -0

Correct IUPAC name for \(H_3C-\underset{\underset{C_2H_5}{|}}{CH}-\underset{\underset{C_2H_5}{|}}{CH}-CH_3\) is

A
2-ethyl-3-methylpentane

B
3,4-dimethylhexane

C
2-sec-butylbutane

D
2,3-dimethylbutane

Question 15
1 / -0

Consider the following four compounds for answering questions

I. \(CH_3-CH_2-CH_2-CH_2-\overset{\overset{O}{||}}{C}-H\)

II. \(CH_3-CH_2-CH_2-\overset{\overset{O}{||}}{C}-CH_3\)

III. \(CH_3-CH_2-\underset{\underset{O}{||}}{C}-CH_2-CH_3\)

IV. \(CH_3-\underset{\underset{CH_3}{|}}{CH}-CH_2-\underset{\underset{O}{||}}{C}-H\)

Which of the following pairs are position isomers?

A
I and II

B
II and III

C
II and IV

D
III and IV

Question 16
1 / -0

In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A): Pent- 1- ene and pent- 2- ene are position isomers.

Reason (R): Position isomers differ in the position of functional group or substituent.

A
Both A and R are correct and R is the correct explanation of A

B
Both A and R are correct but R is not the correct explanation of A

C
Both A and R are not correct

D
A is not correct but R is correct

Question 17

1 / -0

Match Column I with Column II.

Column I	Column II
(i) Dumas method	(a) \(AgNO_3\)
(ii) Kjeldahl’s method	(b) Silica gel
(iii) Carius method	(c) Nitrogen gas
(iv) Chromatography	(d) Free radicals
(v) Hemolysis	(e) Ammonium sulphate

Organic Chemist...

Question 1

3-Ethyl-4, 4-dimethylheptane

4,4-Dimethyl-3-ethylheptane

5-Ethyl-4, 4-dimethylheptane

4,4-Bis(methyl)-3-ethylheptane

Question 2

1-hydroxypentane-1,4-dione

1,4-dioxopentanol

1-carboxybutan-3-one

4-oxopentanoic acid

Question 3

\(CH_3 - CH_2 -\, ^*CH_2 -CH_3\)

\(CH_3 -\, ^*CH = CH - CH_3\)

\(CH_3 - CH_1 - C \equiv\, ^*CH\)

\(CH_3 - CH_2 - CH =\, ^*CH_2\)

Question 4

(i),(ii)

(ii),(iii)

(iii),(iv)

(i),(iv)

Question 5

Both A and R are correct and R is the correct explanation of A

Both A and R are correct but R is not the correct explanation of A

Both A and R are not correct

A is not correct but R is correct

Question 6

(i) → (e) (ii) → (a) (iii) → (d) (iv) → (b) (v) → (c)

(i) → (e) (ii) → (d) (iii) → (b) (iv) → (a) (v) → (c)

(i) → (e) (ii) → (d) (iii) → (a) (iv) → (c) (v) → (b)

(i) → (e) (ii) → (d) (iii) → (a) (iv) → (b) (v) → (c)

Question 7

(i) → (c) (ii) → (b) (iii) → (f) (iv) → (a) (v) → (d) (vi) → (e)

(i) → (c) (ii) → (f) (iii) → (b) (iv) → (e) (v) → (d) (vi) → (a)

(i) → (c) (ii) → (f) (iii) → (b) (iv) → (a) (v) → (d) (vi) → (e)

(i) → (c) (ii) → (f) (iii) → (b) (iv) → (a) (v) → (e) (vi) → (d)

Question 8

Alcohols

Aldehydes

Alkyl halides

Cyanides

Question 9

Distillation

Crystallization

Distillation under reduced pressure

Steam distillation

Question 10

Column chromatography

Solvent extraction

Distillation

Thin layer chromatography

Question 11

Adsorption

Partition

Solubility

Volatility

Question 12

(i),(ii)

(ii),(iii)

(iii),(iv)

(i),(iv)

Question 13

II > I > III

II > III > I

III > I > II

I > II > III

Question 14

2-ethyl-3-methylpentane

3,4-dimethylhexane

2-sec-butylbutane

2,3-dimethylbutane

Question 15

I and II

II and III

II and IV

III and IV

Question 16

Both A and R are correct and R is the correct explanation of A

Both A and R are correct but R is not the correct explanation of A

Both A and R are not correct