Mechanism Test

Result

Mechanism Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

Point out the incorrect statement about resonance?

A
Resonance structures should have equal energy

B
In resonance structures, the constituent atoms must be in the same position

C
In resonance structures, there should not be same number of electron pairs

D
Resonance structures should differ only in the location of electrons around the constituent atoms

Solution

The resonating structures should have same number of electron pairs.
Question 2
1 / -0

Which of the following ions is the most resonance stabilised?

A
Ethoxide

B
Phenoxide

C
Butoxide

D
Isopropoxide

Solution

Phenoxide ion shows maximum resonating structures.
Question 3
1 / -0

Hyperconjugation is

A
σ-π conjugation

B
Noticed due to delocalisation of a and %bonds

C
No bond resonance

D
All the above

Solution

Hyperconjugation involves conjugation of a electrons of C - H bond and π electrons of multiple bond.
It is noticed due to delocalisation of σ- and π-bonds. It is . also known as no bond resonance.
Question 4
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The number of hyperconjugating structures shown by the carbocations are given below. Which one is not correctly matched?

A
hyperconjugating structures

B
hyperconjugating structures

C
hyperconjugating structures

D
No hyperconjugating structures

Solution

shows 6 hyperconjuigatihg structures
Question 5
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In which of the following species hyperconjugation is possible?

A

B
C₆H₅-CH₃

C
CH₂ = CH₂

D

Solution

For hyperconjugation α-carbon with respect to sp² hybridised carbon should have at least one hydrogen.
Question 6
1 / -0

Answer the following question based on the given paragraph.
Stability of carbocation, alkylfree radical and alkene can be explained on the basis of hyperconjugation.
In all these cases, there is presence ofhydrogen atom at theadjacent carbon atom ofsp² hybridised carbon atom. Total number of hyperconjugating structures depends upon the number of hydrogen atoms present at adjacent carbon atom of sp² C-atom.
More the hyperconjugating structures, more is the stabihty of the ion.
Decreasingorder of stabilityof following alkenes is
(i) CH₃ - CH = CH₂
(ii) CH₃ - CH = CH - CH₃
(iii)
(iv)

A
(i) > (ii) > (iii) > (iv)

B
(iv) > (iii) > (ii) > (i)

C
(iii)>(ii)>(i)>(iv)

D
(ii) > (iii) > (iv) > (i)

Solution
Question 7
1 / -0

Which of the following alcohols on dehydration gives most stable carbocation?

A

B

C
CH₃ - CH₂ - CH₂ - CH₂OH

D

Solution

Tertiary carbocation is more stable than secondary and primary carbocatioris.
Question 8
1 / -0

Which of the following contains three pairs of electrons in valence shell?

A
Carbocations

B
Carbanions

C
Nucleophiles

D
Carbenes

Solution

In carbocations, the carbon atom with positive charge has only 6 electrons in its valence shell.
Question 9
1 / -0

Stability of alkyl carbocations can be explained by

A
Inductive effect only

B
Hyperconjugation only

C
Both inductive effect and hyperconjugation

D
Electromeric effect only.

Solution

Stability of alkyl carbocations can be explained by both inductive effect and hyperconjugation.
Question 10
1 / -0

In the given reaction two products are expected.

The product (B) is formed as a major product because

A
The carbocation is formed which is more stable

B
The carbocation CH₃ - CH₂ - is formed which is more stable

C
Both carbocations are equally stable but the nucleophile attacks on central C atom

D
can easily give a proton to attach Br⁺

Solution