Reagents


20 Questions MCQ Test GATE Chemistry Mock Test Series | Reagents


Description
This mock test of Reagents for Chemistry helps you for every Chemistry entrance exam. This contains 20 Multiple Choice Questions for Chemistry Reagents (mcq) to study with solutions a complete question bank. The solved questions answers in this Reagents quiz give you a good mix of easy questions and tough questions. Chemistry students definitely take this Reagents exercise for a better result in the exam. You can find other Reagents extra questions, long questions & short questions for Chemistry on EduRev as well by searching above.
QUESTION: 1

The major product (P) in the given reaction sequence is

Solution:

QUESTION: 2

The major product formed in the following reaction sequences is

Solution:

Favorskii-type ring contraction:

QUESTION: 3

The major product (P) in the given reaction sequence is

Solution:

 
OsO4 forms diols selectively at more electron rich double bond

QUESTION: 4

Given the major product (P)

Solution:

QUESTION: 5

The conect reagent sequence for the following transformation is

Solution:

QUESTION: 6

The major product in the given reaction sequence is

Solution:

*Answer can only contain numeric values
QUESTION: 7

The maximum number of possible stereoisomers of the major product obtained in the following reaction are__________


Solution:

The reagent gives selective reduction of ketone without reducing aldehyde group.
Thus. No. of stereoisomers = 23 = 8

Three chiral centres
(Product)

*Answer can only contain numeric values
QUESTION: 8

The substrate (A) is treated with one equivalent of reagent dicyclohexylborane (Chx2BH). Tlie total number of sp2 hybridized atoms in the major converted molecule are__________________


Solution:

The bulky borane reagent shows addition at terminal alkyne selectively.

*Answer can only contain numeric values
QUESTION: 9

The total number of chiral centres in the major product obtained in the given reaction are_________


Solution:


*Answer can only contain numeric values
QUESTION: 10

The carbonyl compound (A) (0.5 moles) is reacted with 1.5 moles of MeMgBr to give the 0.4 moles of final product (B). The percentage yield is________


Solution:

1 mole of (A) requires 2 moles of MeMgBr to give (B). i.e. 1 : 2 ratio.
Here, the given ratio is 0.5 : 1.5 i.e. 1:3. Therefore. MeMgBr is in excess and (A) is the limiting reactant.

QUESTION: 11

Give the structure of major products (P) and (Q)

Solution:

QUESTION: 12

The major product in the given reaction is

Solution:

Alternative to Wolf-Kishner reduction using LAH at room tempera true

QUESTION: 13

Ill the following reaction sequence, the products (A) and (B) are respectively

Solution:


QUESTION: 14

The major products (X) and (Y) are

Solution:

QUESTION: 15

The major products (A) and (B) respectively, are

Solution:

QUESTION: 16

Give the mjor product (P)

Solution:

*Answer can only contain numeric values
QUESTION: 17

Ill the following reaction. 150 mg o f 1 -octene was reacted with BH3 to give 135 mg o f 1 -octanol

The yield (in % ) in the above reaction is_____________(Round off to two decimal places)


Solution:


*Answer can only contain numeric values
QUESTION: 18

The total number o f alkenes (excluding geometrical isomers) formed in the given reaction is (are)______ answer should be an integer)


Solution:

*Answer can only contain numeric values
QUESTION: 19

The overall yield (in %) of the product in the given reaction sequences is__________(Roud off to one decimal place)


Solution:

Ill linear multistep process (overall yield)
= (95% x 80% x 85% ) x 100 
= (0.95 x 0.8 x 0.85)100 
= 64.6%

*Answer can only contain numeric values
QUESTION: 20

The maximum number of diastereomeiic pairs possible from the major product obtained in following reaction are __________ (answ er should be an integer)


Solution: