Some Chemical Reactions MCQs with Answers

The oxidation of hypo (chlorous acid) to 1-butanone gives:

• A.Butanoic acid
• B.Butanal
• C.1-Butanol
• D.None of these

Reaction at anode is called?

• A.Reduction
• B.Oxidation
• C.Neutralization
• D.Hydrolysis

Which of the following compound reacts slower than benzene in electrophilic substitution?

• A.Toluene
• B.Nitro benzene
• C.Phenol
• D.Aniline

Which one of the following is correct statement?

• A.Oxidation occurs at cathode
• B.Reduction occurs at cathode
• C.Reduction occurs at anode
• D.Oxidation and reduction both occur at cathode

Identify the correct statement related to substitution and elimination of alkyl halides?

• A.Substitution is favored more than elimination by decreasing solvent polarity
• B.Elimination is favored more than substitution by decreasing solvent polarity
• C.Substitution and elimination are equally favored regardless of solvent polarity
• D.Solvent polarity has no effect on either substitution or elimination reactions

Which factor can increase the number of active sites to increase the rate of reaction?

• A.Temperature
• B.Enzyme concentration
• C.pH level
• D.Substrate concentration

Which one of the following is not a sign of chemical change?

• A.Change in colour
• B.Evolution of gas
• C.No change in composition
• D.Change in temperature

Hemiacetal is formed when formaldehyde adds one molecule of ?

• A.Acetone
• B.Methyl alcohol
• C.Acetic acid
• D.Ethyl alcohol

In beta elimination reaction, nucleophile attacks on ?

• A.Alpha carbon
• B.Beta hydrogen
• C.Alpha hydrogen
• D.Beta carbon

What is the main cause of temporary hardness in water?

• A.Calcium bicarbonate
• B.Calcium sulfate
• C.Magnesium chloride
• D.Sodium carbonate