Peptide bond is formed between ?

C. Carboxyl group and amino group

A. Carboxyl group and hydroxyl group

B. Hydroxyl group and amino group

C. Carboxyl group and amino group

D. Carbonyl group and sulfhydryl group

Everyday Science · Atoms, Elements & Compounds · page 3 of 20

Compounds MCQs with Answers

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Compounds MCQs (21–30)

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Past paper MCQs in this chapter · See all past papers

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21.
Which among the following is not an example of mixture?
Correct Answer: B. Common Salt
One-liner
Common Salt (sodium chloride) is not a mixture; it is a pure compound with a fixed chemical composition.
22.
Total number of electron pairs present in the valence shell of central atom in water are
Correct Answer: C. 4
One-liner
The total number of electron pairs in the valence shell of the central oxygen atom in water (H₂O) is 4 — two bond pairs and two lone pairs.
23.
Ratio of sigma bonds and pi bonds present in benzene are _?
Correct Answer: C. 4:1
One-liner
The ratio of sigma (σ) bonds to pi (π) bonds in benzene is 4:1.
24.
Percentage of N₂ in NH₃ is?
Correct Answer: A. 14/17 × 100
One-liner
The percentage of nitrogen (N₂) in ammonia (NH₃) is 14/17 × 100, which equals approximately 82.35%.
25.
Formation of MgO is an example of _?
Correct Answer: D. Ionic bond
One-liner
Formation of MgO is an example of ionic bond.
26.
Peptide bond is formed between ?
Correct Answer: C. Carboxyl group and amino group
One-liner
A peptide bond is formed between the carboxyl group (–COOH) of one amino acid and the amino group (–NH₂) of another amino acid.
27.
The smallest particle of the compound, made up of a group of atoms is known as:
Correct Answer: D. Molecule
One-liner
The smallest particle of a compound made up of a group of atoms is known as a molecule.
28.
All are ionic compounds except _?
Correct Answer: C. NO₂
One-liner
NO₂ (nitrogen dioxide) is a covalent compound, not ionic, because it is formed by sharing of electrons between two non-metals.
29.
The IUPAC name of Mesitylene is ?
Correct Answer: C. 1,3,5-Trimethylbenzene
One-liner
The IUPAC name of Mesitylene is 1,3,5-Trimethylbenzene.
30.
Phenols are ?
Correct Answer: A. Acidic in nature
One-liner
Phenols are acidic in nature due to the ability of the phenoxide ion to be stabilized by resonance.

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Compounds MCQs with Answers

Compounds MCQs (21–30)

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