GOC (Part 4 : Reaction Mechanism) - Live Session

1.

In the reaction The product is –

1.
2.
3.
4.

2.

The products of hydrolysis of

(1) HOCH₂CH₂CH₂CH₂ CHO + CH₃CHO
(2) HOCH₂CH₂CH₂CH₂OH + CH₃CHO
(3) HOCH₂CH₂CH₂CH₂CHO + C₂H₅OH
(4) HOCH₂CH₂CH₂CH₂CH₂OH + C₂H₅OH

3.

The product A is :

(1)
(2)
(3)
(4)

4.

The major end product of the following reaction is

1.
2.
3.
4.

Z

5.

The product in the given reaction is

(1)
(2)
(3)
(4)

6.

Bromination of (E)-2-butenedioic acid gives
(1) (2R, 3S)-2, 3-dibromosuccinic acid
(2) (2R, 3R)-2, 3-dibroniosuccinic acid
(3) a mixture of (2R, 3R) and (2S, 3S)-2, 3-dibromosuccinic acid
(4) (2S, 3S)-2, 3-dibromosuccinic acid

7.

Consider the following reaction:-

Which response contains all the correct statement about this process?
(1)Dehydration
(2)E₂ mechanism
(3)Carbon skeleton migration
(4)Most stable alkene will form
(5)Single-step reaction
(a)1,3 (b)1,2,3 (c)1,2,5 (d)1,3,4
$\to_{heat}^{H_{3} {PO}_{4}} OH +$

8.

Which one of the following undergoes nucleophilic aromatic substitution at the fastest rate?
(1)
(2)
(3)
(4)

9.

In E₂ elimination, some compounds follow Hofmann's rule which means:
1. the double bond goes to the most substituted carbon
2. the compound is resistant to elimination
3. no double bond is formed
4. the double bond goes mainly towards the least substituted carbon

10.

Heterolysis of propane gives:
(1) Methyl and ethyl free radicals
(2) Methylium cation and Ethyl anion
(3) Methyl anion and Ethylium cation
(4) Methylium and Ethylium cations

11.

Carbanions initiate:
(1) addition reactions
(2) substitution reaction
(3) both (1) and (2)
(4) none of these

12.

Ease of abstraction of hydrogen is greater when attached to:
(1) 1 $°$ carbon
(2) 2 $°$ carbon
(3) 3 $°$ carbon
(4) neo carbon

13.

S_N1 mechanism for the reaction,
R-X+KOH $\to$ ROH+KX follow:
(1) carbocation mechanism
(2) carbanion mechanism
(3) free radical mechanism
(4) either of these

14.

The formation of cyanohydrin from a ketone is an example of:
(1) electrophilic addition
(2) nucleophilic addition
(3) nucleophilic substitution
(4) electrophilic substitution

15.

KI in acetone, undergoes S_N2 reaction with each of P, Q, R and S, the rates of the reaction vary as:
Answer to question: KI in acetone, undergoes SN2 reaction with
1. P > Q > R > S
2. S > P > R > Q
3. P > R > Q > S
4. R > P > S > Q

16.

In an S_N1 reaction on chiral centres there is
1. 100% racemisation
2. inversion more than retention leading to partial racemisation
3. 100% retention
4. 100% inversion

17.

Consider the following reaction :

[X] will be :
1.
2.
3.
4.

18.

Match the List-I (Substrate and Reagent) with List-II (Product of the reaction) and select the correct answer from the codes given below the lists:
List-I :
(A)
(B)
(C)
(D)
List-II :
(1)
(2)
(3)
(4)
(5)
Codes :
A B C D
1. 5 3 4 1
2. 5 2 4 1
3. 5 2 1 4
4. 5 2 3 4

19.

Which one of the following is correctly matched?
1.
2.
3.
4.

20.

Arrange the reactivity of alcohols in decreasing order for E1 elimination reaction:

I
II
III
IV

Select the correct answer from the codes given below :
Codes :
1. III > II > IV > I
2. II > III > IV > I
3. II > III > I > IV
4. III > II > I > IV

21.

In the given reaction,

[x] will be :
1. $C H_{3} - C \equiv C H$
2. $H_{2} C = C \equiv C H_{2}$
3. $C H_{3} - C \equiv \overset{⊝}{C} \overset{\oplus}{N a}$
4. $H_{2} C = C \equiv \overset{⊝}{C H} \overset{\oplus}{N a}$

22.

In the given reaction (A) and [X] respectively are :
1. $C_{6} H_{5} - C H B r - C H_{3} a n d C_{6} H_{5} - C \equiv C H$
2. $C_{6} H_{5} - C B r_{2} - C H_{3} a n d C_{6} H_{5} - C \equiv C H$
3. $C_{6} H_{5} - C B r_{2} - C H_{3} a n d C_{6} H_{5} - C B r = C H_{2}$
4. $C_{6} H_{5} - C H B r - C H_{3} a n d C_{6} H_{5} - C H = C H_{2}$

23.

Which of the following reagents gives vic. diol with alkene?
1. $K M n O_{4} / O \overset{⊝}{H}$
2. $H I O_{4}$
3. $C r O_{2} C l_{2}$
4. all of these

24.

In the given reaction,
[X] will be :
1. anhy. $Z n C l_{2}$
2. anhy. $A l C l_{3}$
3. $B F_{3}$
4. all of these

25.

Arrange the reactivity of given compounds in decreasing order for addition reaction :
(1)
(2)
(3)
(4)
Select the correct answer freom the codes given below :
Codes :
1. 1, 2, 3, 4
2. 1, 2, 4, 3
3. 2, 1, 4, 3
4. 2, 1, 3, 4

26.

The product of which reaction will show geometrical isomerism?
1.
2.
3.
4.

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