All Free Chemistry MCQs with Answers

• A. Acidified KMnO4
• B. Acidified K2Cr2O7
• C. Acidified CuCl2
• D. Pyridine

Explanation: Tertiary alcohols are resistant to oxidation .IN the presence of acidified K2CR207 they undergo elimination reaction to give alkene.

• A. Marsh gas
• B. Carbon dioxide and water
• C. Water gas
• D. Methane + H2

Explanation: Explanation for this question will be added soon.

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

Explanation: Option C is correct as "tertiary alcohols" are more reactive because the increased number of alkyl groups increases the positive inductive…

• A. Reaction of alkenes with X2/water
• B. Reaction of alkene with water
• C. Reaction of alkene with H2SO4/water
• D. Reaction of alkene with Ni

Explanation: Option CAlkenes react with water in the presence of concentrated sulphuric acid to form alcoholsCH2=CH2 + H2SO4 --------->…

• A. 10-15 degrees
• B. 25-30 degrees
• C. 25-35 degrees
• D. 25-40 degrees

Explanation: Option C is correct since 25-35 degrees is the perfect range for the process of fermentation.

• A. Propanol
• B. Methanol
• C. Ethanol
• D. Butanol

Explanation: Ethanol shows positive result with iodoform test. Ethanol has a hydrogen atom attached to the carbon with the -OH group.

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

Explanation: Option A: Ethanol is not used as automobile antifreeze. Ethanol is a type of alcohol that is commonly used as a fuel additive or solvent.

• A. 3
• B. 2
• C. 1
• D. 0

Explanation: A tertiary carbon atom is a carbon atom bound to three other carbon atoms.

• A. Glycol and cyclohexanol
• B. Glycerol
• C. Ethylene glycol
• D. Resorcinol

Explanation: This option is correct because trihydric is the compound having three hydroxyl groups (OH). Thus glycerol has three OH groups.

• A. elimination reaction
• B. oxidation reaction
• C. combustion
• D. decomposition

Explanation: This option is correct because alcohol when heated with strong acid (H₂SO H3PO4) undergoes elimination reaction to generate alkene and…

• A. 0.12
• B. 0.14
• C. 0.2
• D. 0.32

Explanation: In fermentation the ethanol obtained never exceeds more than 0.14.

• A. Primary alcohol > secondary alcohol > tertiary alcohol
• B. Methyl alcohol > primary alcohol > secondary alcohol > tertiary alcohol
• C. Primary alcohol < secondary alcohol < tertiary alcohol
• D. Ethanol > primary alcohol > secondary alcohol > tertiary alcohol

Explanation: This option is correct because it shows the correct order of reactivity of alcohol when O-H bond break.

• A. C2H5OH + CH3COOH H2SI4
• B. 2C2H5OH + 2Na ----->2CH5ONa + H2
• C. C2S5OH + HCl ZnClL2 ----->C2H5CL+ H2O
• D. Both Options A and B are correct

Explanation: Option A and B are example of electrophilic attack on alcohol.

• A. CH3-O-CH3
• B. CH3-OH
• C. CH3COOH
• D. CH3COCH3

Explanation: The functional group of alcohol is represented by R-OH, where R represents an alkyl group. Here, CH3-OH is the alcohol.

• A. Carboxylic acids
• B. Phenol
• C. Ethanol
• D. HCl

Explanation: "Ethanol" is the least acidic out of all 4 options and does not form the ethoxide ion hence the answer is C.

• A. Ethane
• B. Ethyne
• C. Ethyl benzene
• D. Ethene

Explanation: Option A is correct as Alkanes are generally unreactive towards oxidizing reagents.

• A. Carbon, carbon monoxide and hydrogen
• B. Carbon and oxygen
• C. Carbon monoxide and hydrogen
• D. Carbon and carbon monoxide

Explanation: a) Carbon, carbon monoxide, and hydrogen:During the incomplete combustion of a hydrocarbon, if there is not enough oxygen available, the…

• A. Ethene
• B. Ethane
• C. Ethyne
• D. Benzene

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

• A. C2H4
• B. C2H2
• C. C2H6
• D. C2H2Br

Explanation: Higher the s− character means that the Bonded pair electrons are held more closely, ensuring a smaller Bond length and a stronger bond.So…

• A. 1-Ethyl-2, 4-dimethlycyclohexane
• B. 2-Ethyl-1,4-dimethylcyclohexene
• C. 2-Ethyl-1, 1-dimethylcyclohexane
• D. 4-Ethyl-1, 2-dimethylcyclohexane

Explanation: The IUPAC name of the compound is 1-ethyl-2,4-dimethylcyclohexane. The parent compound is cyclohexane.