All Free Chemistry MCQs with Answers

• A. Alkylation of benzene
• B. Acylation of benzene
• C. Oxidation of benzene
• D. Halogenations of benzene
• E. ABoth A and B

Explanation: Since the acyl group is added to the benzene as a result of this reaction process we can say that it is an acylation of benzene.

• A. Coloring agent
• B. Dehydrating agent
• C. Decolorizing agent
• D. solubilizing agent

Explanation: Formaldehyde is used in the synthesis of dye fixing agents in dyeing. Also used in disperse dyeing

• A. Benzaldehyde
• B. Acetone
• C. Benzophenone
• D. Benzyl alcohol

Explanation: OPTION A: Aldehydes that have no a -hydrogen atoms undergo Cannizzaro's reaction.

• A. Bakelite
• B. Paraldehyde
• C. Meta-formaldehyde
• D. All of these

Explanation: Under acidic conditions, formaldehyde polymerizes to form meta-formaldehyde, which is a cyclic structure comprising 3 formaldehyde…

• A. A
• B. B
• C. C
• D. D

Explanation: Ketone is a functional group with the structure R2C=O, where R can be a variety of carbon-containing substituent

• A. More stearic hindrance offered by its methyl groups
• B. Electron withdrawing nature of its methyl groups
• C. Its carbonyl carbon is sp2 hybridized
• D. Oxygen of carbonyl group is more electronegative than carbon atom

Explanation: Acetone is less reactive towards nucleophilic addition reaction as compared to acetaldehyde due to greater I-effect of the two alkyl group…

• A. Formaldehyde
• B. Acetaldehyde
• C. Dicmthyl ketone
• D. Propionoldehyde

Explanation: Aldehydes that have no ɑ-hydrogen atoms undergo cannizzaro's reaction. Acetaldehyde possess ɑ-hydrogen therefore it does not give…

• A. They have higher boiling points than that of alkalies
• B. Theyhave lower boiling points than that of alcohols
• C. They have higher boiling point than resulting camphor.
• D. Aldehydes have H-bonding but ketones do not have

Explanation: This statement OPTION D is generally correct. Aldehydes can participate in hydrogen bonding because they have a hydrogen atom directly…

• A. Aldehydes on reduction with NaBH4/H3O+ give 1o alcohol
• B. Ketones on reduction with NaBH4/H3O+ give 2o alcohol
• C. Aldehydes on reduction with N2H4/KOH gives alkane
• D. All of these

Explanation: Option B is correct.No, ketones on reduction with NaBH4/H3O+ do not give 2o alcohols.

• A. Sodium bisulphite
• B. HCI
• C. Grignard reagent
• D. HCN

Explanation: The reason why bulky ketones do not react with sodium bisulphite is because the bulky groups on the ketone make it difficult for the…

• A. K2Cr2O7/H2SO4
• B. HNO3
• C. Tollen's reagent
• D. All of these

Explanation: Aldehydes can be oxidized by all of the listed oxidizing agents. Therefore, option d is correct.

• A. Sulphide ion
• B. Sulphite ion
• C. Hydride ion
• D. Sodium ion

Explanation: In the addition of sodium bisulfite (NaHSO3) to a carbonyl system, the nucleophile is the sulfite ion (SO32-).

• A. Electrophilic addition
• B. Electrophilic substitution
• C. Nucleophilic addition
• D. Nucleophilic substitution

Explanation: The correct answer is c) Nucleophilic addition. Acetone reacts with HCN through nucleophilic addition to form a cyanohydrin.

• A. benzyl alcohol + sodium formate
• B. sodium benzoate + methanol
• C. benzyl alcohol + methanol
• D. sodium benzoate + sodium formate

Explanation: When a mixture of benzaldehyde and formaldehyde is heated with aqueous NaOH (sodium hydroxide) solution, it undergoes a reaction known as…

• A. sp3 hybridized
• B. sp hybridized
• C. sp2 hybridized
• D. un hybridized

Explanation: In aldehydes and ketones, the carbon of the carbonyl group is indeed sp2 hybridized.

• A. Formaldehyde
• B. Acetaldehyde
• C. Methyl ethyl ketone
• D. Acetone

Explanation: When calcium acetate undergoes dry distillation, it does indeed result in the formation of acetone.

• A. Butanol
• B. Propanal
• C. Propanol
• D. Butanal

Explanation: In summary, the compound with the highest boiling point among the given options is "a) Butanol." Butanol can form strong hydrogen bonds…

• A. cyanamide process
• B. Haber process
• C. Serpeck's process
• D. Contact process

Explanation: The Haber process, also called the Haber-Bosch process, is the main industrial procedure for the production of ammonia.

• A. CH3COOH
• B. HCOOH
• C. C2H5OH
• D. Phenol

Explanation: HCOOH, or formic acid, is the strongest acid out of the options

• A. (CH3)2CO
• B. C3H7COCH2CH2CH3
• C. C2H5OC2H5
• D. C2H5CO(CH2)2CH3

Explanation: The unsymmetrical ketones have two different alkyl groups on either side of carbonyl group like