Q 1 :

Number of alkanes obtained on electrolysis of a mixture of ${\mathrm{CH}}_3\mathrm{COONa}$ and ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{COONa}$ is _________ .                  [2024]

Q 2 :

The incorrect statement regarding conformations of ethane is:                          [2024]

• Ethane has infinite number of conformations.

   

• The dihedral angle in staggered conformation is 60°.

   

• Eclipsed conformation is the most stable conformation.

   

• The conformations of ethane are inter-convertible to one-another.

   

Q 3 :

3-Methylhex-2-ene on reaction with HBr in presence of peroxide forms an addition product (A). The number of possible stereoisomers for ‘A’ is ______.           [2024]

Q 4 :

When sec-butylcyclohexane reacts with bromine in the presence of sunlight, the major product is :                [2025]

Q 5 :

The maximum number of RBr producing 2-methylbutane by above sequence of reactions is ______. (Consider the structural isomers only)       [2025]

• 4

   

• 1

   

• 3

   

• 5

   

Q 6 :

Propane molecule on chlorination under photochemical condition gives two di-chloro products, “x” and “y”. Amongst “x” and “y”, “x” is an optically active molecule. How many tri-chloro products (consider only structural isomers) will be obtained from “x” when it is further treated with chlorine under the photochemical condition.        [2025]

• 3

   

• 2

   

• 5

   

• 4

   

Q 7 :

Which of the following conformations will be the most stable?             [2023]

Q 8 :

All structures given below are of vitamin C. Most stable of them is:                    [2023]

Q 9 :

The correct sequence of reagents for the preparation of Q and R is:           [2023]

• $\text{(i) C}{\mathrm{r}}_2{\mathrm{O}}_3,770\mathrm{K},20\mathrm{atm}; \text{(ii) C}{\mathrm{rO}}_2{\mathrm{Cl}}_2,{\mathrm{H}}_3{\mathrm{O}}^{+}; \text{(iii) N}\mathrm{aOH}; \text{(iv) }{\mathrm{H}}_3{\mathrm{O}}^{+}$

   

• $\text{(i) M}{\mathrm{o}}_2{\mathrm{O}}_3,\mathrm{\Delta }; \text{(ii) C}{\mathrm{rO}}_2{\mathrm{Cl}}_2,{\mathrm{H}}_3{\mathrm{O}}^{+}; \text{(iii) N}\mathrm{aOH}; {\text{(iv) H}}_3{\mathrm{O}}^{+}$

   

• $\text{(i) C}{\mathrm{rO}}_2{\mathrm{Cl}}_2,{\mathrm{H}}_3{\mathrm{O}}^{+}; \text{(ii) C}{\mathrm{r}}_2{\mathrm{O}}_3,770\mathrm{K}, 20\mathrm{atm}; \text{(iii) N}\mathrm{aOH}; {\text{(iv) H}}_3{\mathrm{O}}^{+}$

   

• $\text{(i) K}{\mathrm{MnO}}_4,{\mathrm{OH}}^{-}; \text{(ii) M}{\mathrm{o}}_2{\mathrm{O}}_3,\mathrm{\Delta }; \text{(iii) N}\mathrm{aOH}; {\text{(iv) H}}_3{\mathrm{O}}^{+}$

   

Q 10 :

In the following reaction, ‘X’ is                [2023]

• ${\text{Cl–CH}}_2–{({\mathrm{CH}}_2\mathrm{)}}_4–{\text{CH}}_2\text{–Cl}$

   

• 

   

• 

   

• ${\mathrm{CH}}_3{\left({\mathrm{CH}}_2\right)}_4{\mathrm{CH}}_2\mathrm{Cl}$

   

Q 11 :

Number of bromo derivatives obtained on treating ethane with excess of ${\mathrm{Br}}_2$ in diffused sunlight is _______.         [2023]

Q 12 :

Identify A in the following reaction.                         [2026]

Q 13 :

$\mathrm{Ph}-\mathrm{CH}={\mathrm{CH}}_2\underset{\mathrm{HBr}}{\overset{{\left(\mathrm{PhCOO}\right)}_2}{\to }}\text{Product}$

Consider the above reaction.

A. The reaction proceeds through a more stable radical intermediate.
B. The role of peroxide is to generate $H^{•}$ (Hydrogen radical).
C. During this reaction, benzene is formed as a byproduct.
D. 1–Bromo–2–phenylethane is formed as the minor product.
E. The same reaction in absence of peroxide proceeds via carbocation intermediate.

Identify the correct statements. Choose the correct answer from the options given below:    [2026]

• A, B & D Only

   

• A, C & E Only

   

• C, D & E Only

   

• A & E Only

   

Q 14 :

Test Q

• 

   

• Enter Answer here

   

• Enter Answer here

   

• Enter Answer here

   

Q 15 :

How many monocyclic structures are possible for ${\mathrm{C}}_4{\mathrm{H}}_6$ [Consider structural isomers only]

Q 16 :

$n$-Butane on monochlorination under photochemical condition gives an optically active compound "$P$". "$P$" on further chlorination gives dichloro compounds.

The number of dichloro compounds obtained (ignore stereoisomers) is:           [2026]

• 3

   

• 4

   

• 5

   

• 6

   

Q 17 :

Given below are two statements:

Statement I: Methane can be prepared by decarboxylation of sodium ethanoate, Kolbe's electrolysis of sodium acetate and reaction of ${\text{CH}}_3\text{MgBr}$ with water.

Statement II: Methane cannot be prepared from unsaturated hydrocarbons and by Wurtz reaction.

In the light of the above statements, choose the correct answer from the options given below:                   [2026]

• Both Statement I and Statement II are true

   

• Both Statement I and Statement II are false

   

• Statement I is true but Statement II is false

   

• Statement I is false but Statement II is true

   

Q 18 :

The compound (X) on

(i) on heating in the presence of anhydrous ${\text{AlCl}}_3$ and $\text{HCl}$ gas gives 2,4-dimethylpentane

(ii) aromatization gives toluene and

(iii) cyclisation gives methyl cyclohexane

The correct name of compound (X) is:                    [2026]

• Hept-2-ene

   

• Hept-1,3,5-triene

   

• Heptane

   

• Hept-2,4,6-triene

   

Q 19 :

The ratio of mass percentage (w/w) of C : H in a hydrocarbon is 12 : 1. It has two carbon atoms. The weight (in g) of ${\text{CO}}_2\left(\text{g}\right)$ formed when 3.38 g of this hydrocarbon is completely burnt in oxygen is:

(Given: Molar mass in ${\text{g mol}}^{-1}$ C : 12, H : 1, O : 16)               [2026]

• 5.68

   

• 11.44

   

• 22.74

   

• 17.05

   

Q 20 :

$\text{RMgI}$ when treated with ice cold water liberated a gas which occupied $1.4{\text{ dm}}^3/\text{g}$ at STP. The gas produced is further reacted with iodine in presence of ${\text{HIO}}_3$ to give compound $\left(X\right)$. Compound $\left(X\right)$ in presence of Na and dry ether produced compound $\left(Y\right)$. Molar mass of compound $\left(Y\right)$ is _____ ${\text{g mol}}^{-1}$. (Nearest integer)           [2026]

Q 21 :

One mole of an alkane $\left(x\right)$ requires 8 mole oxygen for complete combustion. Sum of number of carbon and hydrogen atoms in the alkane $\left(x\right)$ is _______.       [2026]

Q 22 :

An alkane $\left(Y\right)$ requires 8 moles of oxygen for complete combustion and on chlorination with ${\text{Cl}}_2/h\nu$, $\left(Y\right)$ gives only one monochlorinated product $\left(Z\right)$. The total number of primary carbon atoms in $\left(Y\right)$ is _______ .                         [2026]