NEET (UG)

Practice Test 1 — Organic Chemistry – Some Basic Principles and Techniques

12 questions • 18 minutes • auto-graded with full solutions

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Section A — MCQ (Single Correct & Statement-based)

Question 1

The hybridisation of carbon in methane ($\text{CH}_4$) is:

Solution: Four single bonds = $sp^3$, tetrahedral.

Question 2

The IUPAC name of $\text{CH}_3\text{COCH}_3$ is:

Solution: A ketone with 3 carbons = propan-2-one.

Question 3

Ethanol and dimethyl ether are:

Solution: Same formula, different functional group.

Question 4

Statements: (I) Alkyl groups show +I effect. (II) The inductive effect decreases with distance. Which are correct?

Solution: Both statements are correct.

Question 5

The most stable carbocation is:

Solution: Tertiary is most stable.

Question 6

A nucleophile is:

Solution: Nucleophiles are electron-rich.

Question 7

A solid that vaporises directly is purified by:

Solution: Sublimation suits directly-vaporising solids.

Question 8

Restricted rotation about a C=C double bond gives rise to:

Solution: Cis–trans (geometrical) isomerism.

Section B — Assertion & Reason

Question 9

A: A tertiary carbocation is more stable than a primary carbocation.
R: A tertiary carbocation has more alkyl groups donating electron density by +I and hyperconjugation.

Solution: Electron donation by surrounding alkyl groups stabilises the cation — R explains A.

Question 10

A: Ethanol and dimethyl ether are functional isomers.
R: They have the same molecular formula but different functional groups.

Solution: Same formula, different functional group is exactly functional isomerism — R explains A.

Question 11

A: Free rotation is possible about a carbon–carbon double bond.
R: A double bond contains a pi bond that restricts rotation.

Solution: Rotation about a double bond is restricted (A false); the pi bond is indeed why (R true).

Question 12

A: Fractional distillation is used to separate liquids with close boiling points.
R: A fractionating column provides repeated vaporisation–condensation cycles that improve separation.

Solution: The column's repeated cycles are what make close-boiling liquids separable — R explains A.