21.

Assertion : Addition of HBr on 2-butene gives two isomeric products.

Reason: Addition of HBr on 2-butene follows Markovnikov's rule.

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

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

• If assertion is true, but reason is false.

• Both assertion and reason are false statements.

The pair in which both species have same magnetic moment (spin only value) is

• [Cr(H₂O)₆]²⁺,[CoCl₄]²⁺

• [Cr(H₂O)₆]²⁺,[Fe(H₂O)₆]²⁺

• [Mn(H₂O)₆]²⁺, [Cr(H₂O)₆]²⁺

• [CoCl₄]^2-, [Fe(H₂O)₆]²⁺

The incorrect statement among the following is

• C₆₀ is an allotropic form of carbon

• O_3, is an allotropic form of oxygen

• S₈ is only allotropic form of sulphur

• red phosphorus is more stable in air than white phosphorus.

The colour imparted by Co(II) compounds to glass is

• green

• deep-blue

• yellow

• red

The number of possible isomers of an octahedral complex[Co(C₂O₄)₂(NH₃)₂]^- .

• 1

• 2

• 3

• 4

The ligands in anti-cancer drug cisplatin are

• NH_3, Cl

• NH₃, H₂O

• Cl, H₂O

• NO, Cl

Given below, catalyst and corresponding process/ reaction are matched. The mismatch is

• [RhCl(PPh₃)₂] : Hydrogenation

• TiCl₄+ Al(C₂H₅)₃ : Polymerization

• V₂O₅ : Haber-Bosch process

• nickel : Hydrogenation.

Tincture iodine is

• aqueous solution of I₂

• solution of I₂ in aqueous Kl

• alcoholic solution of I₂

• aqueous solution of Kl.

In [Ag(CN)₂]^-, the number of $\mathrm{\pi }$ bonds is

• 2

• 3

• 4

• 6

The compound molecular in nature in gas phase but ionic in solid state is

• PCl₅

• ${\mathrm{CCl}}_4$

• PCl₃

• POCl₃