Organic Chemistry - Some Basic Principles and Techniques Test

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Organic Chemistry - Some Basic Principles and Techniques Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

What is the molecular formula of naphthalene?

A
C₁₀H₈

B
C₁₀H₉

C
C₁₀H₇

D
C₁₁H₉
Question 2
1 / -0

Which of the following is the correct IUPAC name?

A
5-Ethyl-4, 4-dimethylheptane

B
4, 4-Dimethyl-3-ethylheptane

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

D
3-Ethyl-4,4-dimethylheptane

Solution

While writing IUPAC name, alkyl groups are written in alphabetical order. thus lower locant 3 is assigned to ethyl. prefix di, tri or tetra are not included in alphabetical order
Question 3
1 / -0

Which of the following species does not have an sp² hybridised carbon atom?

A
CH₃⁺

B
CH₃^-

C
:CH₃

D
CH₂
Question 4
1 / -0

Ethylene oxide, when treated with Grignard reagent, yields

A
secondary alcohol

B
tertiary alcohol

C
cyclopropyl alcohol

D
primary alcohol
Question 5
1 / -0

Write the state of hybridisation of carbon in H2C=O and mention the molecular geometry also.

A
sp³hybridised carbon, trigonal pyramidal

B
sp³hybridised carbon, tetrahedral

C
sp²hybridised carbon, trigonal planar

D
sp hybridised carbon, linear

Solution

Due to the presence of a double bond in the carbonyl carbon ( >C=O), carbon is sp² hybridised. This hybridization leads to a trigonal planar geometry which means a bond angle of 120° around the C.
Question 6
1 / -0

The compounds C₂H₅OC₂H₅ and CH₃OCH₂CH₂CH₃ are

A
enantiomers

B
geometrical isomers

C
metamers

D
conformational isomers
Question 7
1 / -0

Which of the following methods is used for the separation of two immiscible liquids?

A
Chromatography

B
Fractional column method

C
Fractional distillation

D
Separating funnel method
Question 8
1 / -0

In general, in the molecules containing multiple bonds,_____ provide the most reactive centres. Choose the most appropriate one.

A
σ bond

B
hyperconjugation

C
p orbitals

D
π bonds

Solution

π bond formed by sideways overlapping of p orbitals/d orbitals on adjacent atoms provides the most reactive centers.

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Re-Attempt Weekly Quiz Competition

Organic Chemistry - Some Basic Principles and Techniques Test - 3

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Organic Chemistry - Some Basic Principles and Techniques Test - 3

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Question 1

C10H8

C10H9

C10H7

C11H9

Question 2

5-Ethyl-4, 4-dimethylheptane

4, 4-Dimethyl-3-ethylheptane

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

3-Ethyl-4,4-dimethylheptane

Solution

Question 3

CH3+

CH3-

:CH3

CH2

Question 4

secondary alcohol

tertiary alcohol

cyclopropyl alcohol

primary alcohol

Question 5

sp3 hybridised carbon, trigonal pyramidal

sp3 hybridised carbon, tetrahedral

sp2 hybridised carbon, trigonal planar

sp hybridised carbon, linear

Solution

Question 6

enantiomers

geometrical isomers

metamers

conformational isomers

Question 7

Chromatography

Fractional column method

Fractional distillation

Separating funnel method

Question 8

σ bond

hyperconjugation

p orbitals

π bonds

Solution

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C₁₀H₈

C₁₀H₉

C₁₀H₇

C₁₁H₉

CH₃⁺

CH₃^-

:CH₃

CH₂

sp³hybridised carbon, trigonal pyramidal

sp³hybridised carbon, tetrahedral

sp²hybridised carbon, trigonal planar