Inductive, electromeric, resonance and hyperconjugation effects — NEET & JEE Questions

Question 1 · difficulty L1 · recall

The permanent displacement of sigma-electron density along a carbon chain due to electronegativity differences is called the

• A. inductive effect
• B. electromeric effect
• C. resonance effect
• D. steric effect

Question 2 · difficulty L2 · understanding

$$\text { Match the LIST-I with LIST-II }$$ List-I Reaction List-I Mechanism A. Williamson Synthesis I. Electrophilic addition B. Friedel Craft Reaction II. Free radical substitution C. Bromination of vinyl benzene III. Nucleophilic substitution D. Chlorination of toluene in light IV. Electrophilic substitution Choose the correct answer from the options given below:

• A. A-III, B-I, C-II, D-IV
• B. A-III, B-IV, C-II, D-I
• C. A-III, B-IV, C-I, D-II
• D. Â A-I, B-III, C-IV, D-II

Question 3 · difficulty L2 · understanding

Increasing order of electron withdrawing power of following functional groups is : a. -CN b. -COOH c. $-\mathrm{NO}_2$ d. -I

• A. $$\mathrm{c}<\mathrm{b}<\mathrm{d}<\mathrm{a}$$
• B. $$\mathrm{c}<\mathrm{a}<\mathrm{b}<\mathrm{d}$$
• C. $$\mathrm{d}<\mathrm{b}<\mathrm{a}<\mathrm{c}$$
• D. $$\mathrm{a}<\mathrm{b}<\mathrm{c}<\mathrm{d}$$

Question 4 · difficulty L2 · understanding

Identify the correct statements : The presence of –NO 2 group in benzene ring A. activates the ring towards electrophilic substitutions. B. deactivates the ring towards electrophilic substitutions. C. activates the ring towards nucleophilic substitutions. D. deactivates the ring towards nucleophilic substitutions. Choose the correct answer from the options given below :

• A. A and D Only
• B. B and D Only
• C. C and A Only
• D. B and C Only

Question 5 · difficulty L2 · understanding

Identify correct statement/s : (A) $-\mathrm{OCH}_3$ and $-\mathrm{NHCOCH}_3$ are activating group. (B) $\quad-\mathrm{CN}$ and -OH are meta directing group. (C) -CN and $-\mathrm{SO}_3 \mathrm{H}$ are meta directing group. (D) Activating groups act as ortho - and para directing groups. (E) Halides are activating groups. Choose the correct answer from the options given below :

• A. $(A),(C)$ and (D) only
• B. $(A),(B)$ and $(E)$ only
• C. (A) and (C) only
• D. (A) only

Question 6 · difficulty L2 · understanding

Match List I with List II : LIST I Mechanism steps LIST II Effect A. I. $$-$$ E effect B. II. $$-$$ R effect C. III. $$+$$ E effect D. IV. $$+$$ R effect Choose the correct answer from the options given below :

• A. (A) - (I), (B) - (II), (C) - (IV), (D) - (III)
• B. (A) - (II), (B) - (IV), (C) - (III), (D) - (I)
• C. (A) - (III), (B) - (I), (C) - (II), (D) - (IV)
• D. (A) - (IV), (B) - (III), (C) - (I), (D) - (II)

Question 7 · difficulty L2 · understanding

The functional group that shows negative resonance effect is :

• A. $-\mathrm{OH}$
• B. $-\mathrm{OR}$
• C. $-\mathrm{COOH}$
• D. $-\mathrm{NH}_2$

Question 8 · difficulty L2 · understanding

Ionic reactions with organic compounds proceed through : (A) homolytic bond cleavage (B) heterolytic bond cleavage (C) free radical formation (D) primary free radical (E) secondary free radical Choose the correct answer from the options given below :

• A. (A) only
• B. (B) only
• C. (C) only
• D. (D) and (E) only

Question 9 · difficulty L2 · understanding

The interaction between $$\pi$$ bond and lone pair of electrons present on an adjacent atom is responsible for

• A. Resonance effect
• B. Electromeric effect
• C. Hyperconjugation
• D. Inductive effect

Question 10 · difficulty L2 · understanding

Resonance in carbonate ion $$\left(\mathrm{CO}_{3}{ }^{2-}\right)$$ is Which of the following is true?

• A. It is possible to identify each structure individually by some physical or chemical method.
• B. All these structures are in dynamic equilibrium with each other.
• C. Each structure exists for equal amount of time.
• D. $$\mathrm{CO}_{3}{ }^{2-}$$ has a single structure i.e., resonance hybrid of the above three structures.