JEE Mains · Chemistry · STD 12 -8.1. Aldehydes and ketones
Given below are two statements:
Statement I: In \(O_2 N\)-\(C_6 H_4\)-\(CH^{\oplus}\)-\(C_6 H_4\)-\(OCH_3\), the carbocation is stabilised by \(+R\) effect of \(-OCH_3\) group.
Statement II: In \(O_2 N\)-\(C_6 H_4\)-\(CH^{\ominus}\)-\(C_6 H_4\)-\(OCH_3\), the carbanion is stabilised by \(-R\) effect of \(-NO_2\) group.
In the light of the above statements, choose the correct answer from the options given below:
- A Both Statement I and Statement II are true
- B Both Statement I and Statement II are false
- C Statement I is true but Statement II is false
- D Statement I is false but Statement II is true
Answer & Solution
Correct Answer
(A) Both Statement I and Statement II are true
Step-by-step Solution
Detailed explanation
Statement I is true because the \(-OCH_3\) group is an electron-donating group. It donates electron density through resonance (\(+R\) effect), which delocalizes the positive charge of the carbocation and stabilizes it. Statement II is true because the \(-NO_2\) group is a strong…
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Chemistry
- For the reaction \(\mathrm{A} \rightarrow\) products.
The concentration of A at 10 minutes is _______ \(\times 10^{-3} \mathrm{~mol} \mathrm{~L}^{-1}\) (nearest integer). The reaction was started with \(2.5 \mathrm{~mol} \mathrm{~L}^{-1}\) of A.JEE Mains 2025 Medium - Given below are two statements:
Statement-\(I\): Since fluorine is more electronegative than nitrogen, the net dipole moment of \(\mathrm{NF}_3\) is greater than \(\mathrm{NH}_3\).
Statement-\(II\): In \(\mathrm{NH}_3\), the orbital dipole due to lone pair and the dipole moment of \(\mathrm{NH}\) bonds are in opposite direction, but in \(\mathrm{NF}_3\) the orbital dipole due to lone pair and dipole moments of \(N-F\) bonds are in same direction.
In the light of the above statements. Choose the most appropriate from the options given below.JEE Mains 2024 Hard - \(0.3\,g\) of ethane undergoes combustion at \(27^{\circ}\,C\) in a bomb calorimeter. The temperature of calorimeter system (including the water) is found to rise by \(0.5^{\circ}\,C\). The heat evolved during combustion of ethane at constant pressure is \(.......kJ\,mol { }^{-1}\). (Nearest integer) [Given : The heat capacity of the calorimeter system is \(20\, kJ\, K ^{-1}, R =8.3\, JK ^{-1}\, mol ^{-1}\). Assume ideal gas behaviour. Atomic mass of \(C\) and \(H\) are \(12\) and \(1\, g\, mol ^{-1}\) respectively]JEE Mains 2023 Hard
- For the first order reaction \(A \rightarrow B\) Br the half life is \(30\,mm\). The time taken for \(75 \%\) completion of the reaction is \(.....mm\). (Nearest mteger) Given : \(\log 2=0.3010\) \(\log 3=0.4771\) \(\log 5=0.6989\)JEE Mains 2023 Hard
- The number of following factors which affect the percent covalent character of the ionic bond is \(............\). \((a)\) Polarising power of cation \((b)\) Extent of distortion of anion \((c)\) Polarisability of the anion \((d)\) Polarising power of anionJEE Mains 2023 Medium
- The possible number of stereoisomers for 5-phenylpent-4-en-2-ol is _______.JEE Mains 2025 Medium
More PYQs from JEE Mains
- The ascending order of relative rate of solvolysis of following compounds is _______.
JEE Mains 2025 Medium - Four point charges \(-q, +q, +q\) and \(-q\) are placed on \(y\) axis at \(y = -2d\), \(y = -d, y = +d\) and \(y = +2d\), respectively. The magnitude of the electric field \(E\) at a point on the \(x -\) axis at \(x = D\), with \(D > > d\), will vary asJEE Mains 2019 Hard
- A sphere of capacitance \(100\) pF is charged to a potential of \(100\) V. Another identical uncharged metal sphere is brought in contact with the charged sphere, then the change in the total energy stored on these spheres, when they touch is \(\alpha \times 10^{-7}\) J. The value of \(\alpha\) is __________. (combined capacitance of spheres is \(200\) pF)JEE Mains 2026 Hard
- The velocity of a particle executing SHM varies with displacement \(( x )\) as \(4 v ^2=50- x ^2\). The time period of oscillations is \(\frac{x}{7} s\). The value of \(x\) is \(............\) \(\left(\right.\) Take \(\left.\pi=\frac{22}{7}\right)\)JEE Mains 2023 Medium
- An object of uniform density rolls up the curved path with the initial velocity \(v_0\) as shown in the figure. If the maximum height attained by an object is \(\dfrac{7v_0^2}{10g}\) (\(g\) = acceleration due to gravity), the object is a _______.
JEE Mains 2026 Medium - Let the inverse trigonometric functions take principal values. The number of real solutions of the equation \(2 \sin ^{-1} x+3 \cos ^{-1} x=\frac{2 \pi}{5}\), is .........JEE Mains 2024 Medium