Chemistry

Chemical Nomenclature

95 Questions

Chemical nomenclature focuses on writing standard IUPAC names for organic and inorganic compounds. This topic is essential for chemistry sections across science exams. Regular practice helps in quickly identifying functional groups and structural priority.

organic compound naminginorganic compound namingIUPAC naming rulesfunctional groups

Chemical Nomenclature Questions

Multiple choice

Sodium bicarbonate is also known as

  1. washing soda

  2. baking soda

  3. hypo

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

Sodium bicarbonate (NaHCO3) is commonly known as baking soda in household use. Washing soda is sodium carbonate (Na2CO3), and hypo is sodium thiosulfate (Na2S2O3).

Multiple choice

The chemical name of 'water' is

  1. sodium carbonate

  2. hydrogen oxide

  3. sodium sulphate

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

Water's chemical name is hydrogen oxide (H2O), where two hydrogen atoms combine with one oxygen atom. While 'dihydrogen monoxide' is more precise, hydrogen oxide is acceptable. Sodium carbonate, sodium sulphate, and calcium oxide are entirely different compounds.

Multiple choice

Which of the following is known as Aqua fortis?

  1. Sulphuric acid

  2. Nitric acid

  3. Potassium nitrate

  4. Sodium nitrate

  5. Barium hydroxide
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This option is correct. Nitrogen pentaoxide and nitrogen oxide  react with water to form small amount of nitric acid also called as aqua fortis.

Multiple choice

Which of the following is not correctly matched?

  1. Galena : Lead sulphide

  2. Green vitriol : Copper sulphate

  3. Plaster of Paris : Calcium sulphate

  4. Calomel : Mercurous chloride
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Green vitriol is actually ferrous sulphate (FeSO4), not copper sulphate (CuSO4). Copper sulphate is called blue vitriol. The other options are correctly matched: Galena is lead sulphide (PbS), Plaster of Paris is calcium sulphate hemihydrate, and Calomel is mercurous chloride (Hg2Cl2).

Multiple choice

IUPAC name of CH3-O-C2H5 is

  1. ethoxymethane

  2. methoxyethane

  3. ethylmethyl ether

  4. methyl ethyl ether

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

IUPAC name of CH3-O-C2H5 is methoxyethane.

Multiple choice

What is the IUPAC name of ethylene?

  1. ethane

  2. ethene

  3. acetylene

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

Ethylene is the common (trivial) name, while ethene is the systematic IUPAC name following the naming convention for alkenes (suffix -ene). Ethane is an alkane, acetylene is the common name for ethyne, and 'none of these' is incorrect since option B is valid.

Multiple choice

What is the IUPAC name of CH3OH?

  1. methanol

  2. methyl alcohol

  3. ethanol

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

CH3OH is methanol, which is the IUPAC name for the simplest alcohol containing one carbon atom. The 'meth-' prefix indicates one carbon, and '-anol' suffix indicates the alcohol functional group.

Multiple choice

What is the IUPAC name of C2H5COOH?

  1. methanoic acid

  2. ethanoic acid

  3. propanoic acid

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

C2H5COOH contains three carbon atoms (two in the ethyl group and one in the carboxyl group). According to IUPAC nomenclature for carboxylic acids, a three-carbon acid is called propanoic acid (prop- for three carbons, -anoic acid for carboxylic acid).

Multiple choice

The IUPAC name for Michler's ketone is

  1. (R)-3-methylcyclopentadecanone

  2. 3,5,5-trimethyl-2-cyclohexene-1-one

  3. 2,6-dimethyl-2,5-heptadien-4-one

  4. 4,4-bis(dimethylamino)benzaphenone

  5. Both (1) and (2)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This option is correct.