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Reagents - Chemistry MCQ


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20 Questions MCQ Test - Reagents

Reagents for Chemistry 2024 is part of Chemistry preparation. The Reagents questions and answers have been prepared according to the Chemistry exam syllabus.The Reagents MCQs are made for Chemistry 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Reagents below.
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Reagents - Question 1

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

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Reagents - Question 2

The major product formed in the following reaction sequences is

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Favorskii-type ring contraction:

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Reagents - Question 3

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

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OsO4 forms diols selectively at more electron rich double bond

Reagents - Question 4

Given the major product (P)

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Reagents - Question 5

The conect reagent sequence for the following transformation is

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Reagents - Question 6

The major product in the given reaction sequence is

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*Answer can only contain numeric values
Reagents - Question 7

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


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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
Reagents - 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__________________


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The bulky borane reagent shows addition at terminal alkyne selectively.

*Answer can only contain numeric values
Reagents - Question 9

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


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*Answer can only contain numeric values
Reagents - 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________


Detailed Solution for Reagents - Question 10

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.

Reagents - Question 11

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

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Reagents - Question 12

The major product in the given reaction is

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

Reagents - Question 13

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

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Reagents - Question 14

The major products (X) and (Y) are

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Reagents - Question 15

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

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Reagents - Question 16

Give the mjor product (P)

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*Answer can only contain numeric values
Reagents - 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)


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*Answer can only contain numeric values
Reagents - Question 18

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


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*Answer can only contain numeric values
Reagents - Question 19

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


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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
Reagents - Question 20

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


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