Question:
Select the option in which all the given functional groups exhibit \(+R\) effect.
Select the option in which all the given functional groups exhibit \(+R\) effect.
Show Hint
Groups having lone pairs directly attached to the aromatic ring generally exhibit \(+R\) effect.
\[
-OH,\;
-OR,\;
-NH_2,\;
-NHR,\;
-NR_2
\]
whereas
\[
-NO_2,\;
-CHO,\;
-COOH,\;
-COR
\]
show \(-R\) effect.
Updated On: Jun 16, 2026
- \(-OH,\; -NH_2,\; -OCOR,\; -NHCOR\)
- \(-OH,\; -NH_2,\; -NO_2,\; -NR_2\)
- \(-CHO,\; -NHR,\; -OR,\; -OCOR\)
- \(-NHR,\; -COOH,\; -NHCOR,\; -OR\)
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Concept:
Groups possessing a lone pair directly attached to the aromatic ring donate electron density through resonance and show \(+R\) (positive resonance) effect.
Groups containing carbonyl carbon directly attached to the ring generally withdraw electrons and show \(-R\) effect.
Step 1: Identify groups showing \(+R\) effect. \[ \begin{aligned} -OH &:\quad +R \\ -NH_2 &:\quad +R \\ -OR &:\quad +R \\ -NHR &:\quad +R \\ -NHCOR &:\quad +R \\ -OCOR &:\quad +R \end{aligned} \]
Step 2: Identify groups showing \(-R\) effect. \[ \begin{aligned} -NO_2 &:\quad -R \\ -CHO &:\quad -R \\ -COOH &:\quad -R \\ -COR &:\quad -R \end{aligned} \]
Step 3: Check each option. \[ \begin{aligned} (A) &:\quad \text{All groups show } +R \text{ effect} \\ (B) &:\quad \text{Contains } -NO_2 \;(-R) \\ (C) &:\quad \text{Contains } -CHO \;(-R) \\ (D) &:\quad \text{Contains carbonyl group } (-R) \end{aligned} \] Therefore, \[\begin{aligned} \boxed{ -OH,\; -NH_2,\; -OCOR,\; -NHCOR } \end{aligned}\] Hence, option \(\mathbf{(A)}\) is correct.
Step 1: Identify groups showing \(+R\) effect. \[ \begin{aligned} -OH &:\quad +R \\ -NH_2 &:\quad +R \\ -OR &:\quad +R \\ -NHR &:\quad +R \\ -NHCOR &:\quad +R \\ -OCOR &:\quad +R \end{aligned} \]
Step 2: Identify groups showing \(-R\) effect. \[ \begin{aligned} -NO_2 &:\quad -R \\ -CHO &:\quad -R \\ -COOH &:\quad -R \\ -COR &:\quad -R \end{aligned} \]
Step 3: Check each option. \[ \begin{aligned} (A) &:\quad \text{All groups show } +R \text{ effect} \\ (B) &:\quad \text{Contains } -NO_2 \;(-R) \\ (C) &:\quad \text{Contains } -CHO \;(-R) \\ (D) &:\quad \text{Contains carbonyl group } (-R) \end{aligned} \] Therefore, \[\begin{aligned} \boxed{ -OH,\; -NH_2,\; -OCOR,\; -NHCOR } \end{aligned}\] Hence, option \(\mathbf{(A)}\) is correct.
Was this answer helpful?
0
0
Top Assam CEE Chemistry Questions
- The molar conductance of KCl, HCl and \( \text{CH}_3 \text{COOK} \) are 152, 425 and 91 cm\(^2\) ohm\(^-1\) respectively. Here, the molar conductance of \( \text{CH}_3 \text{COOH} \) at infinite dilution would be.
- In K[Cr(H\(_2\)O)\(_6\)](C\(_2\)O\(_4\))\(_2\)] .3H\(_2\)O, the spin only magnetic moment of Cr\(^3\) ion is
- The CORRECT order of ionic radii of the following lanthanides is:
- Among the following, the compound with highest melting point is:
- The most effective reaction for the synthesis of 1-methoxy-4-nitrobenzene is:
View More Questions
Top Assam CEE electron displacement effects Questions
Top Assam CEE Questions
- A piece of copper and another of germanium are cooled from room temperature to 100K. The resistance of
- In the uranium radioactive series the initial nucleus is \(^{238}U\) and the final nucleus is \(^{206}Pb\). When the uranium nucleus decays to lead, the number of \(\alpha\)-particles and \(\beta\)-particles emitted respectively are:
- The ratio of specific heats \( \frac{C_P}{C_V} \) in terms of degrees of freedom (n) is given by:
- A transverse wave is described by the equation \( y = A \sin \left( 2 \pi \left( \frac{r}{\lambda} - \frac{t}{T} \right) \right) \). The maximum particle velocity is equal to four times the wave velocity if:
- A pulse of light of duration 50 ns is absorbed completely by a small object initially at rest. Power of the pulse is 60 mW and speed of light is \( 3 \times 10^8 \) m/s. The final momentum of the object is:
View More Questions