Chemistry

Organic Chemistry Fundamentals

237 Questions

Organic chemistry fundamentals cover the structure, properties, and reactions of carbon containing compounds. The questions explore functional groups, isomerism, homologous series, and basic reaction mechanisms. This forms the basis of general chemistry across multiple examination formats.

Functional groupsIsomerism typesHomologous seriesCycloalkanesOrganic monomers

Organic Chemistry Fundamentals Questions

Multiple choice chemistry hydroxy compounds and ethers physical properties of ethers ethers alcohols, phenols and ethers

The isomerism in ether is called as ________.

  1. regio isomerism

  2. metamerism

  3. functional isomerism

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ethers show metamerism. When the two compounds have same ratios of atoms but different arrangements, then they are said to show metamerism. e.g. Methyl propyl ether and diethyl ether have same ratios of carbon, hydrogen and oxygen atoms but different structural arrangements. Hence they are metamers of each other.

Multiple choice chemistry hydroxy compounds and ethers physical properties of ethers ethers alcohols, phenols and ethers

Ethers having same molecular formula but different alkyl groups on either side of the oxygen atoms show:

  1. optical activity

  2. functional isomerism

  3. chain isomerism

  4. metamerism
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ethers having same molecular formula but different alkyl groups on either side of the oxygen atoms show metamerism. Ethoxy ethane and methoxypropane, phenetole and benzyl methyl ether show metamerism.

Multiple choice chemistry hydroxy compounds and ethers physical properties of ethers ethers alcohols, phenols and ethers

Which of the following are metamerism?

  1. Ethoxy ethane and methoxypropane

  2. Phenetole and benzyl methyl ether

  3. Both a and b

  4. None of above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

 Ethers having same molecular formula but different alkyl groups on either side of the oxygen atoms show metamerism. Ethoxy ethane and methoxypropane, phenetole and benzyl methyl ether show metamerism.

Multiple choice chemistry hydroxy compounds and ethers physical properties of ethers ethers alcohols, phenols and ethers

Ethers exbhit which of the following isomerism(s)?

  1. Chain isomerism

  2. Functional isomerism

  3. Metamerism

  4. A, B &C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ethers exhibit chain isomerism ,functional isomerism, Metamerism and Chain isomerism.Ethers with the same formula and having different carbon chain skeletons are called chain isomers.

Functional isomers : Ethers are isomeric with alcohols.
Metamerism Isomers with the same molecular formula but different alkyl groups (around the functional group) are called metamers. An ether with formula $C _4H _{10}O$ has 3 metamers.

Hence option D is correct.






Multiple choice chemistry hydroxy compounds and ethers physical properties of ethers ethers alcohols, phenols and ethers

Which of the following isomerisms is shown by the given two compounds?

$CH _3CH _2CH _2CH _2OCH _3$      and     $CH _3-\overset{CH _3}{\overset{|}{C}H}-CH _2OCH _3$
      1-Methoxybutane                         1-Methoxy - 2 - Methylpropane

  1. Chain isomerism

  2. Positional isomerism

  3. Functional isomerism

  4. Metamerism
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The given two ethers have different carbon atoms on the two sides of a bifunctional group (-O-). Hence these are the metamers of each other.

Multiple choice chemistry hydroxy compounds and ethers physical properties of ethers ethers alcohols, phenols and ethers

$\underset{Diehtyl \,ether}{C _2\,H _5\,O \,C _2 \,H _5}$       $\underset{Methyl \,n -propyl \,ether}{CH _3 \,O \,CH _2 \,CH _2 \,CH _3}$       $\underset{Methyl \,iso \,propyl \,ether}{CH _3 - O - \underset{!!!!!CH _3}{\underset{!!!!!|}{CH} -} CH _3}$
The given compounds exhibit which of the following isomerism?

  1. Chain isomerism

  2. positional isomerism

  3. Metamerism

  4. Functional isomerism
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

$\underset{Diehtyl \,ether}{C _2\,H _5\,O \,C _2 \,H _5}$       $\underset{Methyl \,n -propyl \,ether}{CH _3 \,O \,CH _2 \,CH _2 \,CH _3}$       $\underset{Methyl \,iso \,propyl \,ether}{CH _3 - O - \underset{!!!!!CH _3}{\underset{!!!!!|}{CH} -} CH _3}$

The given compounds exbhit which of the following isomerism Metamerism Isomers with the same molecular formula but different alkyl groups(position of fuctional group is changing so positional isomers) (around the functional group) are called metamers. the given  ether is having the  formula $C _4H _{10}O$ has 3 metamers.

Hence option C is correct.

Multiple choice chemistry hydroxy compounds and ethers physical properties of ethers ethers alcohols, phenols and ethers

Which type of isomerism is exhibited by ${ C } _{ 2 }{ H } _{ 5 }O{ C } _{ 2 }{ H } _{ 5 }$ and $CH _3-O-\underset{CH _3}{\underset{|}{C}H}-CH _3$ ?

  1. Functional

  2. Metamerism

  3. Position

  4. Chain
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The isomerism exhibited by ${ C } _{ 2 }{ H } _{ 5 }O{ C } _{ 2 }{ H } _{ 5 }$ and $CH _3-O-\underset{CH _3}{\underset{|}{C}H}-CH _3$ is metamerism. They have same molecular formula but different alkyl groups on  either side of functional group.

Multiple choice chemistry the p-block elements - group 13 study of orthoboric acid some important compounds of boron study of boron

$H _{3}BO _{3}\xrightarrow{375K} A \xrightarrow{Red \, Heat}B _{2}O _{3}$
$H _{3}BO _{3}\xrightarrow{435K} B \xrightarrow{Red \, Heat}B _{2}O _{3}$


The compounds A & B are:

  1. Orthoboric acid, metaboric acid

  2. Metaboric acid, Tetra boric acid

  3. Tetra boric acid, Metaboric acid

  4. Tetra boric acid, orthoboric acid
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$H _{3} BO _{3} \overset{375K}{\rightarrow} HBO _{2} \overset{red heat}{\rightarrow} B _{2} O _{3} $
$H _{3} BO _{3} \overset{435K}{\rightarrow} H _{2} B _{4} O _{7} \overset{red heat}{\rightarrow} B _{2} O _{3} $

Multiple choice zoology why classification? history of classification of organisms introduction to classification of living organisms living world and classification

Number of series distinguished by Bentham and Hooker is subclass monochlamydeae is

  1. $3$
  2. $5$
  3. $7$
  4. $8$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The group monochlamydaea was one of three within the Dicotyledons, the others being Polypetalae and Gamopetalae. It included plants with flowers that had either a calyx or corolla, but not both. Though, it was later abandoned.

The number of series distinguished by Bentham and Hooker in subclass monochlamydeous were eight.
So, the correct option is '8'.

Multiple choice chemistry p- block elements-ii anomalous properties of nitrogen nitrogen - 15 group group 15 elements

Which of the following is correct statement regarding $N(CH _3) _3$ and $N(SiH _3) _3$?

  1. $N(SiH _3) _3$ is planar and more basic than $N(CH _3) _3$
  2. $N(SiH _3) _3$ is planar and less basic than $N(CH _3) _3$
  3. $N(CH _3) _3$ is planar and more basic than $N(SiH _3) _3$
  4. $N(CH _3) _3$ is pyramidal and less basic than $N(SiH _3) _3$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$N(SiH _3) _3$ is planar due to back bonding and $N(CH _3) _3$ more basic due to presence of lone pair electrons.

Multiple choice chemistry p- block elements-ii group 17 elements - general properties group 17 elements group 17 elements - properties

$  { I } _{ 2 }C{ l } _{  6}$ i s formed by the following reaction:


       $  2IC{ l } _{  3}\rightleftharpoons {I  } _{2  }C{l } _{ 6 }  $

On the basis of the structure of $  {I } _{2  }C{l } _{ 6 }  $, find the number of atoms lying in one plane.

  1. 4

  2. 6

  3. 8

  4. 10
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

I2Cl6 exists as a dimer of ICl3. The structure is planar with two bridging chlorine atoms and two iodine atoms, where all six atoms (two iodine and four chlorine atoms) lie in the same plane.

Multiple choice chemistry basic concepts of chemistry law of multiple proportion law of multiple proportions laws of chemical combination

Which one of the following pairs of compounds illustrates the law of multiple proportions?

  1. $H _{2}O$, $Na _{2}O$
  2. $MgO$, $Na _{2}O$
  3. $Na _{2}O$, $BaO$
  4. $SnCl _{2}$, $SnCl _{4}$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The law of multiple proportions say that if two elementsform more than one compounds between them, then the ratios of the masses of the second element which combine with a fixed mass of the first element will be ratios of small whole numbers. In $SnCl _2$ and $SnCl _4$, the ratio of the weight of Cl reacting with a constant weight of Sn is 2:1.

Multiple choice chemistry basic concepts of chemistry law of multiple proportion law of multiple proportions laws of chemical combination

Which of the following pairs of compound illustrate law of multiple proportions ?

  1. KOH, CsOH
  2. $ H _2O, D _2O $

  3. Ethane , benzene

  4. KCI, KBr
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ethane (C2H6) and benzene (C6H6) are both hydrocarbons (composed of carbon and hydrogen). While they are not the most standard example, they illustrate the law of multiple proportions as they are different compounds formed by the same two elements.