Identify the stereoisomeric pair from the following choices.

Important Questions on Organic Chemistry- Some Basic Principles and Techniques

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Chemistry Crash Course JEE Main>Chapter 17 - Organic Chemistry- Some Basic Principles and Techniques>Level 2>Q 15

The most stable conformation of $2,3$$-$dibromobutane is:

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Chemistry Crash Course JEE Main>Chapter 17 - Organic Chemistry- Some Basic Principles and Techniques>Level 2>Q 16

Which of the following molecules can exhibit optical activity?

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Chemistry Crash Course JEE Main>Chapter 17 - Organic Chemistry- Some Basic Principles and Techniques>Level 2>Q 17

What is the structure of an optical active compound $\left({\mathrm{C}}_3{\mathrm{H}}_2{\mathrm{D}}_2\right)$ which decolourises bromine water.

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Chemistry Crash Course JEE Main>Chapter 17 - Organic Chemistry- Some Basic Principles and Techniques>Level 2>Q 18

An organic compound fused with metallic sodium dissolves in water and the solution is divided into two parts, one part is treated with ${\mathrm{FeSO}}_4$, boiled and filtered. In the filtrate, addition of ${\mathrm{FeCl}}_3$ does not produce any precipitate. To the other part, addition of sodium nitro prusside produces violet colour. The organic compound contains.

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Chemistry Crash Course JEE Main>Chapter 17 - Organic Chemistry- Some Basic Principles and Techniques>Level 2>Q 19

${\mathrm{CH}}_3\mathrm{Br}+{\mathrm{Nu}}^{-}⟶{\mathrm{CH}}_3\mathrm{Nu}+{\mathrm{Br}}^{-}$
The decreasing order of the rate of the above reaction with nucleophiles $\left({\mathrm{Nu}}^{-}\right) \mathrm{A} \mathrm{to} \mathrm{D}$ is
$\left[{\mathrm{Nu}}^{-}= \left(\mathrm{A}\right) \mathrm{PhO}\right.$$\left(\mathrm{B}\right) {\mathrm{AcO}}^{-} \left(\mathrm{C}\right) {\mathrm{HO}}^{-} \left(\mathrm{D}\right) {\mathrm{CH}}_3{\mathrm{O}}^{-}]$

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Chemistry Crash Course JEE Main>Chapter 17 - Organic Chemistry- Some Basic Principles and Techniques>Level 2>Q 20

The ammonia evolved from $2 \mathrm{g}$ of a compound in Kjeldahl's estimation of nitrogen neutralizes $10 \mathrm{mL}$ of $2 \mathrm{M}$ ${\mathrm{H}}_2{\mathrm{SO}}_4$ solution. The weight percentage of nitrogen in the compound is:

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Chemistry Crash Course JEE Main>Chapter 17 - Organic Chemistry- Some Basic Principles and Techniques>Level 2>Q 21

Consider the following organic compound:

To make it a chiral compound, the attack should be on carbon atom number.

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Chemistry Crash Course JEE Main>Chapter 17 - Organic Chemistry- Some Basic Principles and Techniques>Level 2>Q 22

Which of the following is not true for maleic acid and fumaric acid.