All Free Chemistry MCQs with Answers

• A. Ethoxide ion
• B. Tertiary alkoxide ion
• C. Secondary anion
• D. Phenoxide ion

Explanation: in phenoxide ion Oxygen has delocalised-ve charge.it is highly electronegative in nature and stabilised by resonance

• A. Picric acid
• B. Benzene
• C. Cresol
• D. Carbolic acid

Explanation: Option B is correct as Phenol gives out a proton and forms phenoxy anion.

• A. Hydrogenation
• B. Reaction with formaldehyde
• C. Nitration
• D. Halogenation

Explanation: Option A is correct as Phenol is a benzene ring with an OH group bonded to one carbon, if we "hydrogenate" the ring, the carbons will use…

• A. 4-5
• B. 3-5
• C. 2-4
• D. 5-6

Explanation: The solution of phenol in water has a pH of about 5-6 ( depending upon its concentration ).

• A. H2 gas
• B. CO2 gas
• C. O2
• D. None of these options are correct

Explanation: None of these options are correct. Phenols, which are aromatic compounds containing a hydroxyl group (-OH) directly attached to an…

• A. Coke
• B. Pitch
• C. Aromatic compounds
• D. Coal tar

Explanation: Phenol was first obtained from Coal tar Phenol was initially obtained from coal tar.

• A. Carbonic acid
• B. Carbolic acid
• C. Acetic acid
• D. Hydroxy acid

Explanation: Carbonic acid: H2CO3 Acetic acid: CH3COOH (ethanoic acid)Carbolic acid: C6H5OH (phenol)Hydroxy acid: a type of acid found in natural foods

• A. Dense
• B. Hard
• C. Deliquescent
• D. Intermittent

Explanation: Phenol reacts with moisture in the air to give its smell.Phenol is colorless, crystalline solid, and also deliquescent.

• A. Picric acid
• B. Benzene
• C. Cresol
• D. Carbolic acid

Explanation: When phenol is heated with zinc it undergoes a reduction reaction and benzene is formed.

• A. Coke
• B. Pitch
• C. Aromatic compounds
• D. Coal tar

Explanation: Phenol was first obtained from coal tar, which is a byproduct of the coal gasification process.

• A. E = hc/v
• B. E = c/v
• C. E = cv
• D. None of these options are correct

Explanation: The equation for Planck's quantum theory is:E = hfwhere E is the energy of a photon, h is Planck's constant (6.626 x 10^-34…

• A. 6.626 x 10^-3 kJs
• B. 6.262 x 10^-3 Js
• C. 6.626 x 10^-34 Js
• D. 6.262 x 10^3 kJs

Explanation: Remember the value of Planck's constant 'h' is 6.626 × 10-34 Js or 6.26 × 10-37 kJs.

• A. E = hcv
• B. E = c/v
• C. E = cv
• D. None of these options are correct

Explanation: According to Planck's quantum E = hvE = hc/XE = hc/v

• A. Hydrolysis
• B. Hydration
• C. Catabolism
• D. Condensation
• E. Transcription

Explanation: Explanation for this question will be added soon.

• A. Phenol
• B. Benzene
• C. Ethanol
• D. Benzoic Acid

Explanation: The explanation for this question will be added soon.

• A. Acetyl chloride
• B. Alkene
• C. Alkyne
• D. Acetic acid

Explanation: Acetic acid is a colourless liquid organic acid with a pungent smell and sour taste, commonly found in vinegar.

• A. Palmitic acid
• B. Stearic acid
• C. Propionic acid
• D. Valeric acid

Explanation: The explanation for this question will be added soon.

• A. 2-bromo propanal
• B. 3- bromo propenoic acid
• C. 2-bromo butanoic acid
• D. 2-bromo propanoic acid

Explanation: The explanation for this question will be added soon.

• A. Less than water
• B. Less than ethylene glycol
• C. Less than methyl alcohol
• D. Same as ethyl alcohol

Explanation: Surface tension is the tendency of liquid surfaces at rest to shrink into the minimum surface area possible.The SI unit of Surface Tension…

• A. Black
• B. Brown
• C. Purple
• D. Yellow

Explanation: Iodine gives a purple color in organic solvents.c) Purple: Iodine in cyclohexane appears purple.