Free basic chemistry (organic + inorganic) MCQ exam model for premedical students

Explanation:

(Correct): Hydrogenation adds hydrogen across the double bond.

• Dehydration removes water.

• Halogenation adds halogens.

• Oxidation increases oxygen or removes hydrogen.

• Polymerization forms long chains.

Explanation:

(Correct): Al₂O₃ reacts with both acids and bases.

Explanation:

(Correct): Aldehydes reduce Tollens’ reagent forming silver mirror.

Explanation:

(Correct): NH₃ has highly electronegative nitrogen bonded to hydrogen.

• Sulfur is less electronegative.

• Phosphorus does not form strong H-bonds.

• HCl does not show significant hydrogen bonding.

• CO₂ has no hydrogen atoms.

Explanation:

(Correct): But-2-ene shows cis–trans isomerism.

Explanation:

(Correct): Fluorine is the most electronegative element.

• Others: Less electronegative than fluorine.

Explanation:

(Correct): Alkanes are saturated hydrocarbons.

Explanation:

(Correct): Alcohols contain the hydroxyl (–OH) group.

• Carboxylic acid group.

• Aldehyde group.

• Amino group.

• Ketone group.

Explanation:

(Correct): H = +1 (×2), O = –2 (×4); sulfur = +6.

• Others: Incorrect calculations.

Explanation:

(Correct): p-block elements have valence electrons in the p-subshell.

• s-block has valence electrons in s-subshell.

• d-block elements involve d-orbitals.

• f-block involves f-orbitals.

• Transition block refers to d-block elements.