Mechanism Test

Result

Mechanism Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

The carbocation is less stable than

A

B

C

D

Solution

(CH₃)₃C⁺ is more stable than . Rest all are primary carbocations hence less stable.
Question 2
1 / -0

Complete the following reactions by filling most stable intermediate and the product.
(i)
(ii)

A
a

B
b

C
c

D
d

Solution
Question 3
1 / -0

Which of the following statements is not true about the stability of carbanions?

A
Stability of carbanions increases with increase in s-character of orbital

B
The electron withdrawing groups like -NO2, - CN, > c = o increases the stability ofcarbanions

C
Order of stability of carbanions is 3º > 2º > 1º

D
The negatively charged carbon is sp³ hybridised and tetrahedral

Solution

Order of stability of carbanions is 1º > 2º > 3º;
Question 4
1 / -0

Which of the following carbanion expected to be most stable?

A
P-NO₂C₆H₄CH₂

B
0-NO₂C₆H₄CH₂

C
o-CHOC₆H₄CH₂

D
P-CHOC₆H₄CH₂

Solution

Carbanions are stabilised by electron withdrawing groups. - NO₂ is stronger electron withdrawing group as compared to - CHO. At orthoposition, the effect is more pronounced.
Question 5
1 / -0

The order of decreasing stability of the following carbanions is
(i) (CH₃)₃C^-
(ii) (CH₃)₂CH^-
(iii) CH₃CH^-₂
(iv) C₆H₅CH^-₂

A
(i) > (ii) > (iii) > (Iv)

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

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

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

Solution

Stability of carbanions decreases with increase in +l effect. + I effect is maximum in (CH₃)₃C^-, followed by (CH₃)₂CH^- and CH₃CH^-₂. In C₆H₅CH^-₂, resonance effect increases the stability. Hence, the order of stability is (iv) > (iii) > (ii) > (i).
Question 6
1 / -0

Free radicals can undergo

A
Rearrangement to a more stable free radical

B
Decomposition to give another free radical

C
Combination with other free radical

D
All are correct

Solution

Free radicals can undergo all given types of processes.
Question 7
1 / -0

The most stable free radical among the following Is

A

B

C

D
Question 8
1 / -0

Which of the following Is a characteristic feature of a free radical?

A
It has a positive charge

B
It has a negative charge

C
It has all paired electrons

D
It has an unpaired electrons

Solution

Free radical is formed as a result of homolytic fission hence it has an unpaired electron.
Question 9
1 / -0

The increasing order of stability of the following free radicals is

A

B

C

D

Solution

Radical is stabilized by α hydrogen. More the α-hydrogen more will be hyperconjugation more will be radical stabilization resonance. Resonance is also a good stabilizing factor and is given preference than hyperconjugation.
Question 10
1 / -0

Which of the following is a false statement?

A
Free radicals, carbonium ions or carbanions are reaction intermediates

B
Reaction between methane and chlorine in presence of sunlight proceeds via free radical

C
The electronegative atom in the carbon chain produces +I effect

D
Homolytlc fission of C - C bonds gives free radicals

Solution

The electronegative atom in the carbon chain produces -I effect.