Organics Chemistry for NEST Exam 2025

Question 1

What is the general formula for alkanes?

Answer 1

C_nH_(2n+2)

Question 2

True or False: Alkenes are saturated hydrocarbons.

Answer 2

False

Question 3

Fill in the blank: The functional group of alcohols is ______.

Answer 3

-OH

Question 4

What type of reaction involves the addition of water to an alkene?

Answer 4

Hydration

Question 5

Which of the following is a characteristic of aromatic compounds? (a) Saturated, (b) Unsaturated, (c) Contains a benzene ring

Answer 5

c) Contains a benzene ring

Question 6

Define ‘isomerism’.

Answer 6

Isomerism is the phenomenon where compounds have the same molecular formula but different structural arrangements.

Question 7

What is the IUPAC name for CH₃-CH₂-CH₂-CH₃?

Answer 7

Butane

Question 8

True or False: Carboxylic acids have a higher boiling point than alcohols of similar molecular weight.

Answer 8

True

Question 9

What type of reaction occurs when an alkene reacts with a halogen?

Answer 9

Halogenation

Question 10

What is the main difference between a primary and secondary alcohol?

Answer 10

A primary alcohol has the hydroxyl group attached to a carbon that is connected to only one other carbon, while a secondary alcohol has it attached to a carbon connected to two other carbons.

Question 11

Fill in the blank: The simplest ketone is ______.

Answer 11

Acetone

Question 12

Which of the following compounds is an example of an ether? (a) CH₃OH, (b) CH₃OCH₃, (c) CH₃COOH

Answer 12

b) CH₃OCH₃

Question 13

What is the process of converting a liquid into a gas called?

Answer 13

Vaporization

Question 14

True or False: Nitriles contain a carbon triple bonded to nitrogen.

Answer 14

True

Question 15

What is the main characteristic of a nucleophile?

Answer 15

A nucleophile is a species that donates an electron pair to form a chemical bond.

Question 16

What is the product of the complete combustion of hydrocarbons?

Answer 16

Carbon dioxide and water

Question 17

Define ‘saponification’.

Answer 17

Saponification is the process of making soap by reacting fats or oils with an alkali.

Question 18

Which functional group is present in amines?

Answer 18

–NH₂

Question 19

What is the term for a reaction where two molecules combine to form a larger molecule with the loss of a small molecule, often water?

Answer 19

Condensation reaction

Question 20

Fill in the blank: The process of converting an alkene to an alkane is called ______.

Answer 20

Hydrogenation

Question 21

What type of isomerism occurs due to the different spatial arrangements of atoms?

Answer 21

Geometric isomerism

Question 22

Which of the following is a strong acid? (a) Acetic acid, (b) Hydrochloric acid, (c) Formic acid

Answer 22

b) Hydrochloric acid

Question 23

What is the main product of the oxidation of primary alcohols?

Answer 23

Aldehydes

Question 24

True or False: All carbon compounds are organic.

Answer 24

False

Question 25

Name the process of breaking down large organic molecules into smaller ones using heat and/or chemical reactions.

Answer 25

Cracking

Question 26

What is the molecular formula for glucose?

Answer 26

C₆H₁₂O₆

Question 27

Which of the following is a characteristic of aldehydes? (a) They contain a carbonyl group at the end of the carbon chain, (b) They are always solids, (c) They do not react with alcohols.

Answer 27

a) They contain a carbonyl group at the end of the carbon chain

Question 28

What is the main difference between saturated and unsaturated hydrocarbons?

Answer 28

Saturated hydrocarbons contain only single bonds, while unsaturated hydrocarbons contain one or more double or triple bonds.

Question 29

Fill in the blank: The functional group of esters is ______.

Answer 29

-COO-

Question 30

What type of reaction is involved in the formation of an ester from an alcohol and a carboxylic acid?

Answer 30

Esterification