Q 1 :

Given below are two statements :                                              [2025]

Statement (I): Neopentane forms only one monosubstituted derivative.

Statement (II): Melting point of neopentane is higher than $n$-pentane.

In the light of the above statements, choose the most appropriate answer from the options given below :

• Statement I is correct but Statement II is incorrect

   

• Both Statement I and Statement II are correct

   

• Both Statement I and Statement II are incorrect

   

• Statement I is incorrect but Statement II is correct

   

Q 2 :

Isomeric hydrocarbons → negative Baeyer’s test (Molecular formula ${\mathrm{C}}_9{\mathrm{H}}_{12}$)

The total number of isomers from above with four different non-aliphatic substitution sites is _____.            [2025]

Q 3 :

80 mL of a hydrocarbon on mixing with 264 mL of oxygen in a closed U-tube undergoes complete combustion. The residual gases after cooling to 273 K occupy 224 mL. When the system is treated with KOH solution, the volume decreases to 64 mL. The formula of the hydrocarbon is:   [2026]

• $C₄H₁₀$

   

• $C₂H₆$

   

• $C₂H₂$

   

• $C₂H₄$

   

Q 4 :

Consider the following reaction sequence

The percentage of nitrogen in product ‘T’ formed is ______ %. (Nearest integer)
(Given molar mass in g $mol⁻¹$: H : 1, C : 12, N : 14, O : 16)    [2026]

Q 5 :

Consider the following reaction of benzene:

In compound (Q), the percentage of oxygen is ______ %. (Nearest integer)   [2026]

Q 6 :

3, 3-Dimethyl-2-butanol cannot be prepared by :

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

• B Only

   

• B and E Only

   

• B and C Only

   

• B, C and E Only

   

Q 7 :

Consider the following reaction sequence

Compound (y) develops characteristic colour with neutral$FeC{l}_3$ solution.

Identify the INCORRECT statement from the following for the above sequence.  [2026]

• Both compounds x and y will dissolve in NaOH.

   

• Compound y will dissolve in ${\mathrm{NaHCO}}_3$ and evolve a gas.

   

• Compound x is more acidic than compound y.

   

• Both compounds x and y will burn with sooty flame.