AIIMS Chemistry Organic Chemistry Some Basic Principles Techniques Class 11 Questions

In the given compound, chlorine is present on the first position, methyl group is present on the second position and nitro group is present on the fourth position as shown below. Therefore, IUPAC name of the compound is:

The complete reaction is shown below.

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

The stability of carbocation depends upon +M effect, +I effect and +H effect. Carbocation (i) shows eight hyperconjugation structures. Carbocation (ii) shows six hyperconjugation structures. Carbocation (iii) shows nine hyperconjugation structures. Carbocation (iv) shows +M effect. Therefore, the correct stability order is:

Structure of m-methoxy phenol

The given free radicals are shown below: (I) CH₃–ĊH–CH₃, (II) (III) ĊH₂–CH(CH₃)₂ (IV) ĊH₂–CH₃ The stability of free radicals is mostly affected by the factors like resonance, hyperconjugation and inductive effect. In compound (II), there is high resonance effect due to which it is highly stable than other three compounds. The effect of hyperconjugation is directly proportional to the number alpha hydrogen. So, compound I has six alpha hydrogen atoms, compound III has one alpha hydrogen atom and compound IV has three alpha hydrogen atoms. Therefore, the order is

The given compound is shown below: The IUPAC name of the given compound is 5–Methoxy–3–Nitro cyclohexene.

The final major product formed is shown below: [Diagram showing reaction sequence with carbocation rearrangement]

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

Oleum is manufactured by adsorption of sulphur trioxide in concentrated sulphuric acid. The reaction is as follows: H₂SO₄ (l) + SO₃ (g) → H₂S₂O₇ (oleum) The structure of oleum is shown below:

The structure of the given compound

(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:

In case of paper chromatography, there are both stationary and dynamic phases present. So, the statement that it is a stationary phase is incorrect.

The given compounds are shown below. In compound (a), NO₂ possesses the -M effect at para position due to which it is highly acidic than other three compounds. The compound (b) has intermolecular hydrogen bonding and it is less acidic than (a). In compound (d), there is absence of an electron donating group, due to which it is more acidic than compound (c), which has electron donating methyl group. Therefore, the correct order of acidic nature is a > b > d > c.

Suitable reagent for following conversion

The complete reaction is shown below.

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

If HBr attacks on left side double bond of the conjugated diene, then the formation of tertiary carbocation occur which is highly stable and if HBr attacks on right side double bond, the formation of secondary carbocation occurs which is less stable.

Which is most stable conformer of ethan-1,2-diol

Number starts from terminal carbon which has nearest branching.

Assertion: $\text{ZrI}_4$ is useful in purification of Zirconium (Zr) Reason: $\text{ZrI}_4$ sublimes at room temperature.

MnO is:

Assertion: Pure $\text{N}_2$ is obtained from $\text{Ba}(\text{N}_3)_2$ but not from $(\text{NH}_4)_2\text{Cr}_2\text{O}_7$ Reason: On decomposition $(\text{NH}_4)_2\text{Cr}_2\text{O}_7$ gives $\text{O}_2$ gas.

Which have melting point below 500 C °

Yellow color of chlorine water fades because of:

OH group is not available to form a hydrogen bond with water due to presence of intramolecular H⁻bonding. Therefore, o-nitrophenol is hardly soluble in water and m- and p-nitrophenol are soluble.

The structure is shown below:

Which of the following complex is optically inactive

Identify the product formed in the given reaction sequence.

The compound most reactive towards $\text{S}_\text{N}1$ reaction is:

trans isomer has a high melting point because it is symmetrical due to closely packed structure and hence it also take more energy to melt.

Which of the following intermediate is not expected to be formed in the following reaction? [Reaction Image: (Iodomethyl)cyclohexane $\xrightarrow{\text{H}_2\text{O}}$ 1-methylcyclohexanol]

"-I" effect of chlorine makes p-chlorobenzoic acid more acidic because, the presence of electron withdrawing groups on the phenyl ring increases their acidity in comparison to unsubstituted acids.

Assertion: In trans-pent-2-ene, net dipole moment is non zero. [Image: Chemical structure of trans-pent-2-ene] Reason: The dipole moments of $\text{C}-\text{CH}_3$ and $\text{C}-\text{CH}_2\text{CH}_3$ bonds are not equal.

Assertion: Cyclopropane reacts with $\text{Cl}_2$ in dark. Reason: This is due to less reactivity of cyclopropanene.

Assertion: [Image: Cyclopentadienyl cation] is not an aromatic compound. Reason: Presence of $4\pi$ electrons.

Total number of optically active forms in molecules with 'n' number of asymmetric carbon atoms and which are not divisible into two equal halves is 2ⁿ. It is the general formula for determining the stereoisomerism of any organic compound.

Arrange the following in the order of increasing value of the equilibrium constant for hydration, $K_{byd}$ (smallest value first)

Consider the following equation The end product for the given sequence of reaction is

In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct answer out of the following choice. Assertion (A) Nitration of salicylic acid gives picric acid by elimination of $\text{CO}_{2}\text{H}$ group. Reason (R) OH group is strongly activating group hence, SE reaction takes place at o- and p-positions

In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct answer out of the following choice. Assertion (A) Presence of nitro group facilitates nucleophilic substitution reactions in aryl halides. Reason (R) The intermediate carbocation is stable due to presence of nitro group.

Ease of nucleophilic addition in the given compounds is

Which of the following reagents cannot be used for the given conversion?

Arrange the given compounds in decreasing order of boiling points. I. $\text{CH}_3\text{CH}_2\text{CH}_2\text{Br}$ II. $\text{CH}_3 - \text{C}(\text{CH}_3)_2 - \text{Br}$ III. $\text{CH}_3 - \text{CH}_2 - \text{CH}(\text{CH}_3) - \text{Br}$

Which one of the following does not give white precipitate with acidified silver nitrate solution?

The major organic product formed in the following reaction

Match the following structures with their correct configurations.

An organic compound X having molecular mass 60 is found to contain C = 20%, H = 6.67% and N = 46.67%, while rest is oxygen. On heating it gives ammonia along with a solid residue. The solid residue gives violet colour with alkaline copper sulphate solution. The compound X is

Point out incorrect sawhorse drawing(s) for the following compound.

Arrange the given set of compounds in order of increasing boiling points. I.¹⁻chloropropane II. Iso-propyl chloride III.¹⁻chlorobutane