All Free Chemistry MCQs with Answers

• A. CH3 CO2 H and NaOH
• B. C6H5OH and Na
• C. C6H5NH2 and HCl
• D. CH3CO2H and PCl5
• E. CH3COCH3 and LiAlH4

Explanation: Option E is correct because it leads to a reduction reaction of a ketone which forms a secondary alcohol which is a neutral substance.

• A. Ketone
• B. Aldehyde
• C. Ester
• D. Amide

Explanation: Oxidation of primary alcohol leads to the formation of aldehyde.

• A. CH3CO2H and HOCH2CH2CH2CO2H
• B. CH3CO2H and HO2CCH2CH2CO2H
• C. CH3CH2CO2H and HO2CCH2CO2H
• D. CH3CH2CO2H and HOCH2CH2CO2H

Explanation: The answer is C as when the double bond breaks, based on the structure of both the carbons involved in the double bond, each having a…

• A. Tertiary
• B. Secondary
• C. Quaternary
• D. Primary

Explanation: Primary carbon is that carbon atom that is bonded to only one carbon atom. Secondary carbon is bonded to two carbon atoms.

• A. Amines
• B. Alkane
• C. Aldehyde
• D. Alkynes

Explanation: Oxidation of alcohol results in the formation of aldehydes. R-OH gets converted to R-CHO after oxidation.

• A. C2H5OH
• B. CH3OH
• C. HCHO
• D. CH3COOH

Explanation: Methanol is also referred as wood alcohol or wood spirit or wood naphtha as the earliest method for its preparation was by destructive…

• A. Alkyl halides
• B. Alcohols
• C. Alkene
• D. Carboxylic acids

Explanation: Lucas test is used to differentiate and categorise primary, secondary and tertiary alcohols using a solution of anhydrous zinc chloride in…

• A. Tertiary alcohols > secondary alcohol > Primary alcohol
• B. Secondary alcohol > Primary alcohol > tertiary alcohols
• C. Primary alcohol > Secondary alcohol > tertiary alcohol
• D. Tertiary alcohols > Primary alcohol > Secondary alcohol

Explanation: Option A shows the correct order of reactivityof alcohols when C-O bonds break

• A. Absolute alcohol
• B. Methylated alcohol
• C. Rectified spirit
• D. Pure spirit

Explanation: Option A: Absolute alcohol, also known as anhydrous alcohol, is a form of alcohol that is completely pure and does not contain any water.

• A. C - O bond breaks
• B. H bond breaks
• C. Increase in acidity
• D. Dehydration occurs

Explanation: Option A: When a nucleophilic reagent attacks an alcohol, the nucleophile interacts with the carbon atom in the alcohol molecule.

• A. Carboxylic
• B. Aldehydes
• C. Phenols and ethers
• D. Alcohols

Explanation: Carboxylic acids are organic compounds that contain a carboxyl group (-COOH) attached to a carbon atom of an alkyl or aryl group.

• A. Alkanal
• B. Alkyl alcohols
• C. Alkanol
• D. Alkenol

Explanation: In IUPAC (International Union of Pure and Applied Chemistry) naming, alcohols are named as alkanols.

• A. A drink
• B. A fuel
• C. A preservative
• D. All of above

Explanation: Ethanol is used for all of the purposes mentioned: A DRINK: Ethanol is commonly used as an alcoholic beverage and is the type of alcohol…

• A. Primary alcohols
• B. Secondary alcohols
• C. Tertiary alcohols
• D. All of these options are correct

Explanation: OPTION A: Primary alcohols have a hydrogen atom attached to the carbon atom carrying the hydroxyl group, making them more reactive and…

• A. CH3OCH3
• B. CH3OH
• C. CH3COOH
• D. CH3COCH3

Explanation: Option A: is ether due to functional group ROR ( CH3-OCH3)Option B: is alcohol due to presence of hydroxyl (OH) functional group.Option…

• A. Ethanol
• B. Ethene
• C. Ethylene glycol
• D. Propene

Explanation: Ethylene glycol is an alcohol-based organic compound that often serves as an antifreeze agent in vehicle and heating, ventilation, and air…

• A. Primary alcohol
• B. Tertiary alcohol
• C. Methyl alcohol
• D. Secondary alcohol

Explanation: Option A : Primary alcohols are not very reactive when the O-H bond breaks because the carbon atom to which the hydroxyl group is attached…

• A. On heating
• B. Immediately
• C. After 5-10 minutes
• D. After 20 minutes

Explanation: A tertiary alcohol reacts almost immediately with an alkyl halide to form an insoluble alkyl halide that forms an oily layer on the surface

• A. MgO
• B. CaO
• C. CO2
• D. Cl2

Explanation: Is correct as it is a PTB line tha states " Redistillation of rectified spirit in the presence of CaO gives absolute alcohol "

• A. Primary alcohol
• B. Secondary alcohol
• C. Tertiary alcohol
• D. All of above

Explanation: Is correct as we know that the liquids which have prominent hydrogen bonding have higher boiling points and in primary alcohols the…