AIIMS Chemistry Questions

IUPAC name of

Which has least covalent radius.

The complete reaction is shown below.

The complete reaction is shown below.

Correct order of electrophilic substitution reaction is:

Stability order of following carbocation is :

$\text{A} \xrightarrow{\text{Ph}-\text{SO}_2\text{Cl}} \text{B} \xrightarrow{\text{KOH}} \text{C} \xrightarrow{\text{C}_2\text{H}_5\text{I}} \text{D}$'C' is water solubleCorrect structure of A and D are

Correct order of SN2 reaction is:

Match following coloumn: | Polymer | Monomer | | :--- | :--- | | (i) Buna-S | (P) Styrene | | (ii) ethylene glycol | (Q) terylene | | (iii) elastomer | (R) chloroprene |

Which is least soluble

Assertion: Phenol is more acidic then m-methoxy phenol Reason: $\text{–OCH}_3$ shows +I effect

$$\text{Ph}-\text{CH}_2-\text{CH}=\text{CH}-\text{CH}_3 \xrightarrow[\text{(ii) Alk. KOH}]{\text{(i) Br}_2}$$

Which of the following reacts most slowly with nitric acid.

Assertion: $\text{CH}_3 - \underset{\substack{| \\ \text{CH}_3}}{\overset{\substack{\text{CH}_3 \\ |}}{\text{C}}} - \text{O} - \text{CH}_3$ React with HBr to form $(\text{CH}_3)_3\text{CBr}$ and $\text{CH}_3\text{OH}$ Reason: It follows SN1 mechanism

Find the end product of reaction

$\text{Phenol} + \text{Aniline} \xrightarrow{\text{C}_6\text{H}_5\text{N}_2^+\text{Cl}^- / \text{KOH}} \text{Major Product: Product will be :}$

Product is:

Compare stability of free radicals (I) $$\text{CH}_3-\dot{\text{C}}\text{H}-\text{CH}_3$$ (II) $$\text{C}_6\text{H}_5-\dot{\text{C}}\text{H}_2$$ (III)$$\dot{\text{C}}\text{H}_2-\text{CH}(\text{CH}_3)_2 \qquad \text{(IV) }\dot{\text{C}}\text{H}_2-\text{CH}_3$$

In processing of steel which of the following allotropes of carbon is used.

Assertion : Glyceraldehyde reacts with 2 2 Br /H Oto form achiral compound Reason: –CHO and $\text{–CH}_{2}\text{OH}$ both are oxidized

Correct order for reaction with alcoholic KOH

Assertion: Propene reacts with HI in presence of peroxide give¹⁻iodopropane. Reason: 1° free radical is less stable than 2° free radical

Assertion : d⁵ configuration is more stable than d⁴ Reason : d⁵ has more exchange energy as compared to d⁴ because 10 & 6 exchanges are possible in d⁵ & d⁴ respectively.

$-\text{NH}-\text{C}(=\text{O})-\text{NH}-\text{NH}_2\text{ group}\rangle \xrightarrow{\text{(i)HCl} / \text{(ii)}\Delta} \text{Major product of following reaction}$

Write IUPAC name of following compound

$\langle\text{1-chloro-2-methoxybenzene structure}\rangle \xrightarrow{\text{HNO}_3 / \text{H}_2\text{SO}_4} \text{Major Product, product will be :}$

$\text{H}-\overset{\substack{\text{O} \\ ||}}{\text{C}}-\text{H} + \text{CH}_3-\text{CH}=\text{O} \xrightarrow{\text{Conc. NaOH}}$ Find out the products of reaction

Correct order of basic strength is:

Which of the following is incorrect about cyanogen gas? (1) It has bent structure (2) It is psuedohalogen. (3) Its behavior is similar to halides. (4) both carbon are sp hybridised

Identify structure of ‘P’ and ‘Q’ Correct order of pKa value is:

Which of the following statement is correct for oleum ?

Which is incorrect for paper chromatograph

(i) $\text{F}_3\text{C}-\text{COOH}$ , (ii) $\text{CH}_3\text{COOH}$ , (iii) $\text{C}_6\text{H}_5\text{COOH}$ ,(iv) $\text{CH}_3\text{CH}_2\text{COOH}$ Correct order of $\text{pK}_\text{a}$ value is:

IUPAC name of give compound:

Assertion: I₂O₅ is used to detect CO. Reason : In I₂O₅ the oxidation number of I is 5.

Which of the following complex is optically inactive (1) [RhCl(CO)(PPh₃)(NH₃)] (2) [Fe(C₂O₄)₃]³⁻ (3) [Fe(en)₂Cl₂] (4) [Pd(en)₂Cl₂]

How many spectral line of Balmer series present in visible region :

Assertion: Anhydrides are more reactive than ester for nucleophilic substitution. Reason:– $\text{R.COO}^{-}$ is better leaving group than $\text{R-O}^{-}$

Order of acidic nature

Suitable reagent for following conversion

Assertion: Two sugar units joined by 1,2-glycosidic bond in sucralose. Reason: It contains 1 C-glucose and 2 C -fructose glycosidic bond

Correct increasing order for the wavelength of absorption in the visible region for the complexes of Co³⁺ is: (1) [Co(CN)₆]³⁻, [Co(NH₃)₆]³⁺, [Co(NH₃)₅(H₂O)]³⁺[Co(NH₃)₅Cl]²⁺ (2) [Co(CN)₆]³⁻, [Co(NH₃)₅(H₂O)]³⁺[Co(NH₃)₅Cl]²⁺ [Co(NH₃)₆]³⁺, (3) [Co(NH₃)₅]²⁺, [Co(CN)₆]³⁻, [Co(NH₃)₅(H₂O)]³⁺[Co(NH₃)₅Cl]²⁺ (4) [Co(NH₃)₅Cl]²⁺, [Co(NH₃)₅(H₂O)]³⁺, [Co(NH₃)₄]³⁺, [Co(CN)₆]³⁻

For a first order gas phase reaction : $$\text{A}_{(\text{g})} \rightarrow 2\text{B}_{(\text{g})} + \text{C}_{(\text{g})}$$ $\text{P}_0$ be initial pressure of A and $\text{P}_t$ the total pressure at time ‘t’. Integrated rate equation is :

The complete reaction is shown below.

Assertion: m-Bromotoluene can be prepared by m-toluidene. Reason: Amino group is meta directing

C + O₂(g) ⟶ CO₂ ...... (i); ΔH = -393 kJ mol⁻¹ H₂ + 1/2 Ω₂ ⟶ H₂O ...... (ii); ΔH = -287.3 kJ mol⁻¹ 2CO₂ + 3H₂O ⟶ C₂H₅OH + 3O₂ ...... (iii); ΔH = 1366.8 kJ mol⁻¹ Find the standard enthalpy of formation of C₂H₅OH(l)

The complete reaction is shown below.

Out of $\text{BeF}_2, \text{MgF}_2, \text{CaF}_2, \text{SrF}_2$ which has maximum solubility :

The complete reaction is shown below.

Assertion: Hydroquinone is more acidic than resorcinol. Reason: OH shows I− effect