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

Which of the following pairs of compounds can be used to illustrate Dalton's Law of Multiple Proportions?

  1. $NH _{4}$ and $NH _{4}Cl$
  2. $SO _{2}$ and $SO _{3}$
  3. $H _{2}$ and $O _{2}$
  4. $H _{2}O$ and $HCl$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Law of Multiple proportions states that if two elements form more than one compound between them, then the ratios of masses of second element which combine with a fixed mass of first element ratios of small whole numbers.

$*$ Ex: 1) $CO, CO _2$           2) $SO _2, SO _3$           3)$CuO, Cu _2O$ etc.

Multiple choice biology ecology carbon cycling mineral coal carbon cycle

The number of possible enantiometric pairs that can be produced during monochorination of 2-methyl butane is:

  1. 2

  2. 3

  3. 4

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

Monochlorination of 2-methylbutane can occur at four different carbon positions. The products formed at the chiral center (C2) result in a pair of enantiomers. The other positions do not create new chiral centers in this specific molecule, resulting in 2 enantiomeric pairs total.

Multiple choice chemistry the periodic table mendeleef's periodic table mendeleev's periodic law and its limitations mendeleev's periodic table development of the modern periodic table into the history

Cycloalkanes are isomeric with

  1. Alkenes

  2. Alkanes

  3. Alkynes

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

Cycloalkanes are isomeric with alkenes because they have the same general formula CnH2n but possessing different structures, shows ring chain isomerism. Example- cyclohexane $(C _6H _12)$ and hexene $(C _6H _12)$ are ring chain isomers.

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

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

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.