Organic Chemistry Multiple Choice Questions and Answers – Displacement Substitution Reaction & Electron Movement

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Questions
1 Which of the following statement is false for substitution reaction?
A One functional group in a compound replaces another functional group
B We can classify substitution reaction by nucleophile and electrophile
C We can classify substitution reaction only by nucleophile and electrophile
D Substitution reactions are divided into three general classes, depending on the type of atom or group that acts as the substituent

Answer: We can classify substitution reaction only by nucleophile and electrophile
2 Why the chloroform layer becomes purple, when a colourless solution of potassium iodide is passed through a colourless solution of chloroform?
A Iodine
B Chlorine
C Potassium chloride
D Potassium iodide

Answer: Iodine
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3 A layer of reddish brown precipitate which is formed on the iron knife, when an iron knife is dipped in an aqueous solution of copper sulphate is of which compound or element?
A Iron sulphate
B Copper
C Rust
D Copper sulphate

Answer: Copper
4 What is the correct order of reactivity series of the halogen?
A F > Cl > Br > I
B I > Cl > Br > F
C F > Br > Cl > I
D I > Br > Cl > F

Answer: F > Cl > Br > I
5 Which of the following is a not method of electron movement?
A Bond breaking
B Bond making
C Bond movement
D Revolution of bond

Answer: Revolution of bond
6 Which of the following statement is false for electron movement?
A The formal charge becomes one unit more positive at the starting atom and one unit more negative at the terminal atom
B The last arrow in a chain must be either a bond making arrow terminating at a sextet atom, or a bond breaking arrow.
C When a bond is broken, this is represented by a curved arrow pointing towards from the bond from which electron will be transfered and ending the arrow pointing away towards the next unoccupied molecular orbital
D Curly arrows are superimposed over the structural formulae of reactants in a chemical equation to show the reaction mechanism

Answer: Curly arrows are superimposed over the structural formulae of reactants in a chemical equation to show the reaction mechanism
7 Who proposed arrow pushing method of showing progression of electons?
A Sir Robert Robinson
B Robert Burns Woodward
C Adolf Von Baeyer
D Victor Grignard

Answer: Sir Robert Robinson
8 Electrons movement take place from __________
A positively to negatively components
B negatively to positively charged components
C neutral to charged species
D charged species to neutral

Answer: negatively to positively charged components
9 Which species are formed due to Homolytic bond breakage?
A Anion
B Cation
C Free radical
D Atoms

Answer: Free radical
10 Which of the following type of reaction shows heterolytic bond cleavage?
A SN1 reaction
B Addition reaction
C Elimination reaction
D Free radical halogenation

Answer: Free radical halogenation

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