Which of the following is aromatic?

112.

KI and CusO₄ solution when mixed gives :

• CuI₂ + K₂SO₄

• Cu₂I₂ + K₂SO₄ + I₂

• K₂SO₄ + Cu₂I₂ + I₂

• K₂SO₄ + CuI₂ + I₂

In the reaction ,  $\stackrel{{\mathrm{NaNH}}_2/\mathrm{liq}. \mathrm{ammonia}}{\to }$ A , the major product A is :

Assertion : CN^- ion is an ambident nucleophile.

Reason: Nucleophiles are electron rich species.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false

• If both assertion and reason are false

Calcium burns in nitrogen to produce a white powder which dissolves in sufficient water to produce a gas A and an alkaline solution .The solution on exposure to air produces a thin solid layer of B on the surface .The compounds A and B will be :

• Ca₃N₂ , NH₃

• NH₃ , CO₂

• Ca(OH)₂ , CaCO₃

• NH₃ , CaCO₃

Arrange the following compounds in increasing order of reactivity towards nucleophilic addition reaction.

(I) C₆H₅COCH₃

(II) CH₃CO-C₂H₅

(III) C₆H₅CHO

(IV) Cl-CH₂-CHO

• IV > III > II > I

• IV > II > III > I

• I > II > III > IV

• III > IV > II > I

Which of the following compounds are optically active?

• 1 and 2

• 2 and 3

• 3 and 4

• 1 and 4

Number of isomers of C₅H₆

• 2

• 3

• 4

• 5

Assertion : Phosphoric acid has no reducing properties.

Reason : Phosphoric acid does not contain P-H bonds.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion : 1, 2-dichloroethane is optically active.

Reason : Meso compound is optically active.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.