The compound that does not undergo Friedel-Crafts alkylation reaction but gives a positive carbylamine test is :
- Aniline
- Pyridine
- N-methylaniline
- Triethylamine
The Correct Option is A
Solution and Explanation
Friedel-Crafts alkylation requires an electrophilic aromatic substrate. Aniline does not undergo Friedel-Crafts alkylation because the amino group (-\(NH_2\)) on the benzene ring strongly activates the ring towards electrophilic attack, leading to significant reactivity and making it difficult to control the reaction. Furthermore, the lone pair of electrons on the nitrogen atom in aniline coordinates with the Lewis acid catalyst (like \(AlCl_3\)),
deactivating the ring and preventing alkylation.
The carbylamine test is positive for primary amines. Aniline is a primary amine and will give a positive test.
Top Questions on reaction mechanism
- Given below are two statements:
Statement I: The dipole moment of R–CN is greater than R–NC and R–NC can undergo hydrolysis under acidic medium to produce R–COOH.
Statement II: R–CN hydrolyses under acidic medium to produce a compound which on treatment with SOCl$_2$, followed by the addition of NH$_3$ gives another compound (X). This compound (X) on treatment with NaOCl/NaOH gives a product, that on treatment with CHCl$_3$/KOH/$\Delta$ produces R–NC.
In the light of the above statements, choose the correct answer from the options given below.
- JEE Main - 2026
- Chemistry
- reaction mechanism
- Given below are two statements:
Statement I: Phenol on treatment with \( \mathrm{CHCl_3/aq.\ KOH} \) under refluxing condition, followed by acidification produces p-hydroxy benzaldehyde as the major product and o-hydroxy benzaldehyde as the minor product.
Statement II: The mixture of p-hydroxybenzaldehyde and o-hydroxybenzaldehyde can be easily separated through steam distillation.
In the light of the above statements, choose the correct answer from the options given below- JEE Main - 2026
- Chemistry
- reaction mechanism
The correct order of the rate of reaction of the following reactants with nucleophile by \( \mathrm{S_N1} \) mechanism is:
(Given: Structures I and II are rigid)
- JEE Main - 2026
- Chemistry
- reaction mechanism
- Best reducing agent among the given ions are:
- JEE Main - 2024
- Chemistry
- reaction mechanism
- Match the following:
LIST I LIST II A Lyman I Near IR B Balmer II Far IR C Paschen III Visible D p-fund IV UV - JEE Main - 2024
- Chemistry
- reaction mechanism
Questions Asked in NEET exam
- Two cities X and Y are connected by a regular bus service with a bus leaving in either direction every T min. A girl is driving scooty with a speed of 60 km/h in the direction X to Y. She notices that a bus goes past her every 30 minutes in the direction of her motion, and every 10 minutes in the opposite direction. Choose the correct option for the period T of the bus service and the speed (assumed constant) of the buses.
- NEET (UG) - 2025
- Relative Velocity
- A physical quantity P is related to four observations a, b, c, and d as follows: P = a3 b2 (c / √d) The percentage errors of measurement in a, b, c, and d are 1%, 3%, 2%, and 4% respectively. The percentage error in the quantity P is:
- NEET (UG) - 2025
- Dimensional analysis and its applications
What is Microalbuminuria ?
- NEET (UG) - 2025
- Human physiology
The output (Y) of the given logic implementation is similar to the output of an/a …………. gate.
- NEET (UG) - 2025
- Logic gates
- An oxygen cylinder of volume 30 litre has 18.20 moles of oxygen. After some oxygen is withdrawn from the cylinder, its gauge pressure drops to 11 atmospheric pressure at temperature \(27^\circ\)C. The mass of the oxygen withdrawn from the cylinder is nearly equal to: [Given, \(R = \frac{100}{12} \text{ J mol}^{-1} \text{K}^{-1}\), and molecular mass of \(O_2 = 32 \text{ g/mol}\), 1 atm pressure = \(1.01 \times 10^5 \text{ N/m}^2\)]
- NEET (UG) - 2025
- Ideal-gas equation and absolute temperature