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 the p-block elements - group 13 study of diborane some important compounds of boron study of boron

Which is/are correct representation of boranes?

  1. $B _n\, H _{n\, +\, 4}$
  2. $B _n\, H _{n\, +\, 6}$
  3. $B _n\, H _{2n\, +\, 2}$

  4. None of these
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

The correct representation of boranes include (A) $B _n\, H _{n\, +\, 4}$, called as nido-boranes and (B) $B _n\, H _{n\, +\, 6}$, called as arachno boranes.
(C) $B _n\, H _{2n\, +\, 2}$ is not a correct representation of boranes.
Note: $B _n\, H _{n\, +\, 6}$ are less stable than $B _n\, H _{n\, +\, 4}$

Multiple choice chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

Identify $(E)$ and $(F)$ in the following:
$CaCO _3\rightarrow \underset{(g)}{(A)}+\underset{(solid)}{(B)}$

$(B)+H _2O\rightarrow (C)\overset{(A)}{\rightarrow}(D)\overset{(A)excess}{\rightarrow}(E)$

$(A)+NH _3\overset{\Delta}{\rightarrow}(F)$

  1. $(E)\ Ca(HCO _3) _2;\ (F)\ NHCONH _3$
  2. $(E)\ Ca(HCO _3); \ (F)\ NH _3CONH$
  3. $(E) \ Ca(HCO _3) _2; \ (F)\ NH _2CONH _2$

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

$CaCO _3\rightarrow \underset{(g)}{CO _2}+\underset{(solid)}{CaO}$
$CaO+H _2O\rightarrow (Ca(OH) _2)\overset{(CO _2)}{\rightarrow}(CaCO _3)\overset{(CO _2)excess}{\rightarrow}(Ca(HCO _3) _2)$
$(CO _2)+NH _3\overset{\Delta}{\rightarrow}(NH _2CONH _2)$
Hence option C is correct.

Multiple choice

A molecule has ________________.

  1. 2 or more elements

  2. 2 or more atoms

  3. 2 or more substances

  4. 2 or more motions
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A molecule is defined as a group of two or more atoms held together by chemical bonds. It can consist of atoms of the same element or different elements.

Multiple choice

CH4

  1. carbon hydride

  2. methane

  3. carbon hydrogen

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

CH4 is the chemical formula for methane, the simplest alkane and the primary component of natural gas.

Multiple choice some important compounds of magnesium and calcium the s-block elements chemistry

Product (S) are :

$Mg _2C _3 {\xrightarrow []{D _2O} } \,\, { \xrightarrow[2.H _2O/\bar{O}H]{1.BH _3.THf}} \,\,{\xrightarrow {H _2/Ni} }\,\, \xrightarrow[\Delta]{Conc.H _3PO _4} (S)$

  1. ${\text{H}}\mathop {\text{C}}\limits _{\mathop {\text{D}}\limits^{\text{|}} } = {\text{CH - C}}{{\text{D}} _{\text{3}}}$
  2. ${{\text{H}} _2}\mathop {\text{C}}\limits _{\mathop {\text{D}}\limits^{\text{|}} } - {\text{CH}}\;{\text{ = }}\;{\text{C}}{{\text{D}} _2}\;\;$
  3. ${{\text{H}} _{\text{2}}}{\text{C}}\; = {\text{CH - C}}{{\text{H}} _{\text{3}}}$
  4. ${{\text{H}} _{\text{2}}}{\text{C}} = \mathop {\text{C}}\limits _{\mathop {\text{D}}\limits^{\text{|}} } - {\text{C}}{{\text{H}} _{\text{3}}}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mg2C3 reacts with D2O to form propyne-d4 (CH3-C=CD). Hydroboration-oxidation adds OH and H across the triple bond, followed by reduction and dehydration, leading to the specified product structure.

Multiple choice chemistry coordination chemistry werner's theory werner's theory of coordination compounds coordination compounds

The two isomers X and Y with the formula $Cr(H _2O) _5ClBr _2$ were taken for experiment on depression in freezing point. It was found that one mole of X gave depression corresponding to $2$ moles of particles and one mole of Y gave depression due to $3$ moles of particles. The structural formulae of X and Y respectively are:

  1. $[Cr(H _2O) _5Cl]Br _2$; $[Cr(H _2O) _4Br _2]Cl\cdot H _2O$
  2. $[Cr(H _2O) _5Cl)]Br _2$; $[Cr(H _2O) _3ClBr]\cdot 2H _2O$
  3. $[Cr(H _2O) _5Br]BrCl$; $[Cr(H _2O) _4ClBr]Br\cdot H _2O$
  4. $[Cr(H _2O) _4Br _2]Cl\cdot H _2O$; $[Cr(H _2O) _5Cl]Br _2$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$Cr(H _2O) _5ClBr _2\longrightarrow$ 2 moles of particle.

It compoubnd is $[Cr(H _2O) _4(Br _2)]Cl.H _2O$
It gives $[Cr(H _2O) _4Br _2]^{+},C\bar l\Rightarrow $ Two particles.
So, $X=[Cr(H _2O) _4Br _2]Cl.H _2O$
If $Y=[Cr(H _2O) _5Cl]Br _2$
It gives $[Cr(H _2O) _5Cl^{2+},2B\bar r\Rightarrow $ 3 particles.

Multiple choice bio-chemistry biological molecule lipids and their function some biomolecules lipids

Number of double bonds present in arachidonic acid is

  1. $4$
  2. $3$
  3. $2$
  4. $1$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Arachidonic acid is a carboxylic acid which has 20 carbon and four double bonds in the cis configuration. It is a polyunsaturated fatty acid (PUFA). It is mainly present in the membrane phospholipids and in platelets. It is also found in liver, erythrocytes, skeletal muscle, cardiac muscle. Meat, egg, and fish are rich sources of arachidonic acid.

Thus, the correct answer is option A.

Multiple choice

What is the general formula for an alkene?

  1. CnH2n

  2. CnH2n+2

  3. CnH2n-2

  4. CnH2n+4
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Alkenes are hydrocarbons with one double bond between carbon atoms. The general formula for an alkene is CnH2n, where n is the number of carbon atoms.

Multiple choice

What is the general formula for an alkyne?

  1. CnH2n

  2. CnH2n+2

  3. CnH2n-2

  4. CnH2n+4
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Alkynes are hydrocarbons with one triple bond between carbon atoms. The general formula for an alkyne is CnH2n-2, where n is the number of carbon atoms.