NEET 2024 Chemistry Questions

The most stable carbocation among the following is:

The most stable carbocation among the following is:

The compound that will undergo SN1 reaction with the fastest rate is:

A compound with a molecular formula $\ce{C6H14}$ has two tertiary carbons. Its IUPAC name is:

On heating, some solid substances change from the solid to the vapour state without passing through the liquid state. The technique used for the purification of such substances based on the above principle is known as:

A compound X contains 32% of A, 20% of B and the remaining percentage of C. The empirical formula of X is (given atomic masses A = 64, B = 40, C = 32 u):

The most stable carbocation among the following is:

A compound with a molecular formula of \ce{C6H14} has two tertiary carbons. Its IUPAC name is:

Given below are two statements: Statement I: The boiling point of three isomeric pentanes follows the order n-pentane > isopentane > neopentane. Statement II: When branching increases, the molecule attains a shape of sphere. This results in smaller surface area for contact, due to which the intermolecular forces between the spherical molecules are weak, thereby lowering the boiling point. In the light of the above statements, choose the most appropriate answer from the options given below:

Match List-I with List-II. List-I (Reaction): A. Cyclohexene (cyclic alkene) $\rightarrow$ open-chain dicarbonyl compound B. Benzene $\rightarrow$ benzophenone (diphenyl ketone, \ce{C6H5-CO-C6H5}) C. Cyclohexanol (\ce{-OH}) $\rightarrow$ cyclohexanone (\ce{C=O}) D. Ethylbenzene (\ce{C6H5-CH2CH3}) $\rightarrow$ benzoic acid (\ce{C6H5-COOH}) List-II (Reagents/Condition): I. Anhyd. \ce{AlCl3} II. \ce{CrO3} III. \ce{KMnO4/KOH},\ $\Delta$ IV. (i) \ce{O3}, (ii) \ce{Zn-H2O} Choose the correct answer from the options given below:

For the given reaction, 'P' is: \ce{C6H5-CH=CH-C6H5 ->[KMnO4/H+] P} (major product) (stilbene undergoes oxidation with hot acidic potassium permanganate)

Identify the correct answer.

Match List-I with List-II. List-I (Molecule): A. ethane; B. ethene; C. carbon molecule, \ce{C2}; D. ethyne List-II (Number and types of bond/s between the two carbon atoms): I. one $\sigma$-bond and two $\pi$-bonds; II. two $\pi$-bonds; III. one $\sigma$-bond; IV. one $\sigma$-bond and one $\pi$-bond Choose the correct answer from the options given below:

Match List-I with List-II. List-I (Compound): A. \ce{NH3}; B. \ce{BrF5}; C. \ce{XeF4}; D. \ce{SF6} List-II (Shape/geometry): I. Trigonal pyramidal; II. Square planar; III. Octahedral; IV. Square pyramidal Choose the correct answer from the options given below:

Intramolecular hydrogen bonding is present in which of the following compounds? (Structures (A), (B) and (D) are shown in the figure; (C) is \ce{HF}.)

Arrange the following elements in increasing order of first ionization enthalpy: \ce{Li}, \ce{Be}, \ce{B}, \ce{C}, \ce{N}.

Among Group 16 elements, which one does NOT show the $-2$ oxidation state?

Arrange the following elements in increasing order of electronegativity: \ce{N}, \ce{O}, \ce{F}, \ce{C}, \ce{Si}.

The highest number of helium atoms is present in

1 gram of \ce{NaOH} is treated with 25 mL of 0.75 M \ce{HCl} solution. The mass of \ce{NaOH} left unreacted is

A compound X contains 32\% of A, 20\% of B and the remaining percentage of C. The empirical formula of X is (atomic masses: A = 64, B = 40, C = 32 u)

In which of the following processes does entropy increase? A. A liquid evaporates to vapour. B. Temperature of a crystalline solid is lowered from $130\ \text{K}$ to $0\ \text{K}$. C. $\ce{2NaHCO3(s) -> Na2CO3(s) + CO2(g) + H2O(g)}$ D. $\ce{Cl2(g) -> 2Cl(g)}$ Choose the correct option:

The work done during the reversible isothermal expansion of one mole of hydrogen gas at $25^\circ\text{C}$ from a pressure of $20$ atmosphere to $10$ atmosphere is: (Given $R = 2.0\ \text{cal\,K}^{-1}\text{mol}^{-1}$)

The energy of an electron in the ground state ($n=1$) for the \ce{He+} ion is $-x$ J. Then the energy of an electron in the $n=2$ state for the \ce{Be^3+} ion, in J, is:

Match List-I with List-II: List-I (Quantum Number) (A) $m_l$ (B) $m_s$ (C) $l$ (D) $n$ List-II (Information provided) (I) shape of orbital (II) size of orbital (III) orientation of orbital (IV) orientation of spin of electrons Choose the correct option:

Which reaction is NOT a redox reaction?

The compound that will undergo $\ce{S_N1}$ reaction with the fastest rate is

The products $A$ and $B$ obtained in the following reactions, respectively are $\ce{3 ROH + PCl3 -> 3 RCl + }A$ $\ce{ROH + PCl5 -> RCl + HCl + }B$

Identify the major product $C$ formed in the following reaction sequence: $\ce{CH3CH2CH2I ->[NaCN]}$ $A$ $\ce{->[\text{partial hydrolysis}][OH^-]}$ $B$ $\ce{->[NaOH + Br2]}$ $C$ (major)

Major products $A$ and $B$ formed in the following reaction sequence are: 2-methylcyclohexan-1-ol $\ce{->[PBr3]}$ $A$ (major) $\ce{->[\text{alc. KOH}][\Delta]}$ $B$ (major)

Identify the correct reagents that would bring about the following transformation (an alkene converted, via the anti-Markovnikov primary alcohol, to an aldehyde):

Which one of the following alcohols reacts instantaneously with Lucas reagent?

The products A and B obtained in the following reactions, respectively, are: \ce{3 ROH + PCl3 -> 3 RCl + A} \ce{ROH + PCl5 -> RCl + HCl + B}

Identify the correct reagents that would bring about the following transformation: \ce{C6H5-CH2-CH=CH2 -> C6H5-CH2-CH2-CHO} (allylbenzene is converted to 3-phenylpropanal)

'Spin only' magnetic moment is same for which of the following ions? A. $\ce{Ti^3+}$ B. $\ce{Cr^2+}$ C. $\ce{Mn^2+}$ D. $\ce{Fe^2+}$ E. $\ce{Sc^3+}$ Choose the most appropriate answer from the options given below:

Match List-I with List-II: List-I (Complex) (a) \ce{[Co(NH3)5(NO2)]Cl2} (b) \ce{[Co(NH3)5(SO4)]Br} (c) \ce{[Co(NH3)6][Cr(CN)6]} (d) \ce{[Co(H2O)6]Cl3} List-II (Type of isomerism) (i) Solvate isomerism (ii) Linkage isomerism (iii) Ionization isomerism (iv) Coordination isomerism Choose the correct option:

Given below are two statements: Statement I: Both $\ce{[Co(NH3)6]^3+}$ and $\ce{[CoF6]^3-}$ complexes are octahedral but differ in their magnetic behaviour. Statement II: $\ce{[Co(NH3)6]^3+}$ is diamagnetic whereas $\ce{[CoF6]^3-}$ is paramagnetic. In the light of the above statements, choose the correct answer from the options given below:

Given below are two statements: Statement I: \ce{[Co(NH3)6]^3+} is a homoleptic complex whereas \ce{[Co(NH3)4Cl2]+} is a heteroleptic complex. Statement II: Complex \ce{[Co(NH3)6]^3+} has one kind of ligands but \ce{[Co(NH3)4Cl2]+} has more than one kind of ligands. In the light of the above statements, choose the correct answer from the options given below:

Fehling's solution 'A' is:

Match List-I with List-II: List-I (Reaction) (a) \ce{C6H6 -> C6H5-CO-C6H5} (benzophenone) (b) Alkene \ce{->} carbonyl (oxidative cleavage) (c) \ce{C6H5-OH ->} carbonyl (oxidation) (d) \ce{C6H5-CH2-CH3 -> C6H5-COOH} List-II (Reagents/Condition) (i) \ce{C6H5COCl}, anhyd. \ce{AlCl3} (ii) \ce{CrO3} (iii) \ce{KMnO4}/\ce{KOH}, $\Delta$ (iv) (1) \ce{O3}, (2) \ce{Zn-H2O} Choose the correct option:

Identify the correct reagents that would bring about the transformation \ce{C6H5-CH2-CH=CH2 -> C6H5-CH2-CH2-CHO} (allylbenzene to 3-phenylpropanal).

'Spin only' magnetic moment is same for which of the following ions? A. \ce{Ti^3+} B. \ce{Cr^2+} C. \ce{Mn^2+} D. \ce{Fe^2+} E. \ce{Sc^3+} Choose the most appropriate answer from the options given below:

The $E^\circ$ value for the \ce{Mn^3+}/\ce{Mn^2+} couple is more positive than that of \ce{Cr^3+}/\ce{Cr^2+} or \ce{Fe^3+}/\ce{Fe^2+} due to the change of

The pair of lanthanoid ions which are diamagnetic is

Fehling's solution 'A' is

The reagents with which glucose does NOT react to give the corresponding test/product are: A. Tollen's reagent B. Schiff's reagent C. \ce{HCN} D. \ce{NH2OH} E. \ce{NaHSO3} Choose the correct option from those given below:

The Henry's law constant ($K_H$) values of three gases (A, B, C) in water are 145, $2 \times 10^{-5}$ and 35 kbar, respectively. The solubility of these gases in water follow the order:

The plot of osmotic pressure ($\pi$) vs concentration (mol L⁻¹) for a solution gives a straight line with slope 25.73 L bar mol⁻¹. The temperature at which the osmotic pressure measurement is done is: (Use $R = 0.083$ L bar mol⁻¹ K⁻¹)

Match List-I with List-II: List-I (Conversion) (A) $1$ mol of \ce{H2O} to \ce{O2} (B) $1$ mol of \ce{MnO4-} to \ce{Mn^2+} (C) $1.5$ mol of \ce{Ca} from molten \ce{CaCl2} (D) $1$ mol of \ce{FeO} to \ce{Fe2O3} List-II (No. of Faraday required) (i) $3\,F$ (ii) $2\,F$ (iii) $1\,F$ (iv) $5\,F$ Choose the correct match:

Mass in grams of copper deposited by passing $9.6487$ A current through a voltmeter containing copper sulphate solution for $100$ seconds is: (Given: Molar mass of \ce{Cu} $= 63$ g mol$^{-1}$, $1\,F = 96487$ C)

Which of the following plots of $\ln k$ versus $\frac{1}{T}$ is consistent with the Arrhenius equation?

Activation energy of any chemical reaction can be calculated if one knows the value of

Given below are two statements: Statement I: Aniline does not undergo Friedel-Crafts alkylation reaction. Statement II: Aniline cannot be prepared through Gabriel synthesis. In the light of the above statements, choose the correct answer from the options given below:

Identify the major product $C$ formed in the following reaction sequence: \ce{CH3CH2CH2I ->[NaCN] A ->[OH^-/NaOH][partial\ hydrolysis] B ->[Br2/NaOH] C}