Chemistry

Organic Chemistry Fundamentals

287 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 physics spectra the electromagnetic spectrum electromagnetic spectrum electromagnetic waves

The spectrum of molecular form the substance is called :

  1. band spectrum

  2. line spectrum

  3. absorption spectrum

  4. continuous spectrum
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In spectrum. Band spectra is the name given to groups of lines so closely spaced that each group appears to be a band, nitrogen spectrum. Band spectra, or molecular spectra, are produced by molecules radiating their rotational or vibrational energies

Hence the option A is the right answer

Multiple choice chemistry energy rocks and minerals petroleum and natural gas fossil fuels

Reforming (also called aromatization) is the conversion of aromatic hydrocarbons into aliphatic hydrocarbons containing the same number of carbon atoms.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Reforming (also called aromatization) is the conversion of aliphatic hydrocarbons into aromatic hydrocarbons containing the same number of carbon atoms.

Multiple choice chemistry energy rocks and minerals petroleum and natural gas fossil fuels

Which one is true for the octane number of following organic compounds?

  1. Aromatic Compound $>$ Aliphatic compound
  2. Aromatic compound $<$ Aliphatic compound
  3. Aromatic compound $=$ Aliphatic compound

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The octane number of a fuel is based on how fuels auto-ignite, under compression.
1. It is based on the scale where isooctane is 100 (minimal ignition under pressure) and heptane is 0 (easily ignites under pressure).
For example, petrol with an octane number of 92 has the same knock as a    mixture of 92% isooctane and 8% heptane.
2. Octane rating decreases with an increase in the carbon chain length.
3. Octane ratings increase with carbon chain branching.
4. Octane ratings increase in aromatics with the same number of carbons.

Hence, the correct option is $A$
Multiple choice chemistry energy rocks and minerals petroleum and natural gas fossil fuels

Most of the chemical reactions in Cracking is based on:

  1. Carbocation formation

  2. Carbanion formation

  3. Radical formation

  4. Zwitter ion formation
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In cracking, the initial process involves the breaking down of hydrocarbons into free radicals.Only a small fraction of the feed molecules actually undergo initiation, but these reactions are necessary to produce the free radicals that drive the rest of the reactions.

Multiple choice chemistry energy rocks and minerals petroleum and natural gas fossil fuels

Select the correct option about the Octane number of the organic compound.

  1. Saturated compound $>$ Unsaturated compound
  2. Saturated compound $<$ Unsaturated compound
  3. Saturated compound $=$ Unsaturated compound

  4. Both A and B
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

An unsaturated compound has a higher octane rating than a saturated compound.

Multiple choice chemistry energy rocks and minerals petroleum and natural gas fossil fuels

The correct relation of the Octane number for the following is:

  1. straight chain $>$ branched chain
  2. straight chain $<$ branched chain
  3. straight chain $=$ branched chain

  4. both A and B
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The octane number of a fuel is based on how fuels auto-ignite, under compression.

1. It is based on the scale where isooctane is 100 (minimal ignition under pressure) and heptane is 0 (easily ignites under pressure).

2. Octane rating decreases with an increase in the carbon chain length.

3. Octane ratings increase with carbon chain branching.

4. Octane ratings increase in aromatics with the same number of carbons.

Hence, the correct option is $B$.
Multiple choice chemistry the p-block elements - group 13 study of diborane some important compounds of boron study of boron

Which of the following statement is correct for diborane ?

  1. Small amines like $NH _3,\, CH _3NH _2$ give unsymmetrical cleavage of diborane
  2. Large amines such as $(CH _3) _3N$ and pyridine gives symmetrical cleavage of diborane

  3. Small as well as large amines both gives symmetrical cleavage of diborane

  4. (A) and (B) both
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$Small\quad amines\ { B } _{ 2 }{ H } _{ 6 }+{ 2NH } _{ 3 }\rightarrow [{ H } _{ 2 }B\left( { NH } _{ 3 } \right) _{ 2 }]^{ + }[{ BH } _{ 4 }]^{ - }\ Large\quad amines\ { B } _{ 2 }{ H } _{ 6 }+2N\left( { CH } _{ 3 } \right) _{ 3 }\rightarrow 2{ H } _{ 3 }B\leftarrow N\left( { CH } _{ 3 } \right) _{ 3 }$

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

Number of terminal hydrogen atoms present in diborane?

  1. 2

  2. 4

  3. 6

  4. 8
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Diborane is an electron deficient molecule. The two boron atoms and the four terminal hydrogen atoms of the molecule are all in the same plane. These four terminal B -H bonds are regular 2-centered- 2 electron bonds. The bridging hydrogen atoms lie above and below this plane.

Hence option B is correct answer.

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 air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

Which of the following is the natural sources of the most volatile hydrocarbon?

  1. Methane

  2. Ethane

  3. Ester

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

Methane is a chemical compound with the chemical formula $C{ H } _{ 4 }$ (one atom of carbon and four atoms of hydrogen). It is a group 14 hydride and the simplest alkane, and is the main component of natural gas.In its natural state, methane is found both below ground and under the sea floor. When it finds its way to the surface and the atmosphere, it is known as atmospheric methane