Reactivity of Molecules Reaction Mechanism

• Electronegativity is defined as the power of an atom in a molecule to a) Repel electrons towards itself b) Attract electrons towards itself c) Expand itself d) All of the mentioned

• How does the electronegativiy gets affected with the negative oxidation state? a) It decreases b) It increases c) It remains constant d) None of the mentioned

• The factors on which electronegativity depends upon a) Valence state of atom b) Hybridisation c) Both valence state and hybridisation d) None of the mentioned

• The electronegativity of sp2 hybridised atom will be a) 3.29 b) 2.48 c) 3.69 d) 2.75

• Arrange the following groups in the order of decreasing (+I) effect. a) C6H5O– > COO– > CR3 > CHR2 > H b) C6H5O– > H > CR3 > CHR2 > COO– c) CR3 > C6H5O– > H > COO– > CHR2 d) C6H5O– > COO– > CHR2 > CR3 > H

• Which of the following is a permanent electron displacement effect? a) Inductomeric b) Electromeric c) Inductive d) All of the mentioned

• Select the correct statement from the following option a) When multiple bonds are present between two different atoms, electromeric shift towards the more electronegative atom takes place b) When multiple bonds are present between two similar atoms, the first possibility is symmetric alkenes or alkynes c) When multiple bonds are present between two similar atoms, the second possibility is asymmetric alkenes or alkynes d) All of the mentioned

• Arrange the following groups in the order of decreasing (-I) effect. a) CN > F > Br > Cl > COOH > I > H b) COOH > CN > F > Br > Cl > I > H c) H > COOH > CN > I > Cl > F > Cl d) CN > COOH > F > Cl > Br > I > H

• Which of the following is an application of inductive effect? a) Bond length b) Dipole moment c) Strength of carboxylic acids d) All of the mentioned

• Due to presence of C – X polar bond in alkyl halide, alkyl halides are a) More reactive than corresponding alkane b) Less reactive than corresponding alkane c) Equally reactive as corresponding alkane d) None of the mentioned

• Relative basic strength of amines does not depend upon a) Inductive effect b) Mesomeric effect c) Steric effect d) Stabilisation of cation by hydration

• Which of the following is a temporary effect brought into play at the requirement of attacking reagent? a) Inductive effect b) Mesomeric effect c) Electromeric effect d) Inductomeric effect

• Select the correct statement from the following option. a) Conjugate effect is stronger than (-I) effect b) Conjugate effect is weaker than (-I) effect c) Conjugate effect is same as (-I) effect d) None of the mentioned

• When the complete transfer of π-electrons take place away from the atom at the requirement of attacking agent, it is called a) (-E) effect b) (+E) effect c) (-I) effect d) (+I) effect

• Which of the following is an example of lewis base? a) ZnCl2 b) BF3 c) NH3 d) FeCl2

• The positively charged and electron deficient compounds which have a tendency to form a bond by accepting the electron pair are known as a) Electrophiles b) Nucleophiles c) Homophiles

• Which of the following is an incorrect statement about the nucleophiles? a) They are electron rich b) They possess an empty orbital to receive the electron pair c) They attack electron deficient centres d) Examples are: OH–, NH3, H2O etc

• Lewis acids are the examples of nucleophilic reagents. a) True b) False

• Which of the following is a resonance effect? a) Inductive effect b) Electromeric effect c) Mesomeric effect d) Inductomeric effect

• Which of the following molecule will show highest dipole moment? a) CH3Cl b) CH3Br c) CH3F d) CH3I

• Those groups which are electron repelling and have lesser electron attracting power than hydrogen show a) (+E) effect b) (-E) effect c) (-I) effect d) (+I) effect

• In mesomeric effect, the electrons are transferred from a) A multiple bonds to an atom b) A multiple bonds to a single covalent bond c) An atom with a lone pair to the adjacent single covalent bond d) All of the mentioned

• The phenomenon in which 2 or more structures, involving identical position of atoms can be written for a particular molecule, is called a) Conjugation b) Resonance c) Hyper conjugation d) Vibration

• The resonance energy is defined as a difference in energy between a) Two consecutive resonating structures b) Resonance hybrid and most unstable resonating structure c d) First and last resonating structures