21.

The equation which is balanced and represents the correct product(s) is

• Li₂O + 2KCl → 2LiCl + K₂O

• [COCl(NH₃)₅]⁺ + 5H⁺ → Co²⁺

• [Mg(H₂O)₆]²⁺ + (EDTA)^4-  [Mg(EDTA)]²⁺ + 6H₂O

• [Mg(H₂O)₆]²⁺ + (EDTA)^4-  [Mg(EDTA)]²⁺ + 6H₂O

In S_N2 reactions, the correct order of reactivity for the following compounds CH₃Cl, CH₃CH₂Cl, (CH₃)₂CHCl and (CH₃)₃CCl is

• CH₃Cl > (CH₃)₂CHCl >CH₃CH₂Cl > (CH₃)₃CCl

• CH₃Cl > CH₃CH₂Cl > (CH₃)₂CHCl >(CH₃)₃CCl

• CH₃CH₂Cl > CH₃Cl >(CH₃)₂CHCl >(CH₃)₃CCl

• CH₃CH₂Cl > CH₃Cl >(CH₃)₂CHCl >(CH₃)₃CCl

On heating an aliphatic primary amine with chloroform and ethanolic potassium hydroxide, the organic compound formed is

• an alkanol

• an alkaneodiol

• an alkyl cyanide 

• an alkyl cyanide 

The most suitable reagent for the conversion of 

R-CH₂ -OH →R- CHO is

• KMnO₄

• K₂Cr₂O₇

• CrO₃

• CrO₃

The major organic compound formed by the reaction of 1,1,1-trichloroethane with silver powder is

• acetylene

• ethene

• 2-butyne

• 2-butyne

Which one of the following bases is not present in DNA?

• Quinoline

• Adenine

• Cytosine

• Cytosine

Sodium phenoxide when heated with CO₂ under pressure at 125^oC yields a product which on acetylation products C.

Considering the basic strength of amines in aqueous solution, which one has the smallest pK_b value?

• (CH₃)₂NH

• CH3NH2

• (CH₃)₃N

• (CH₃)₃N

Which one is classified as a condensation polymer?

• Dacron

• Neoprene

• Teflon

• Teflon

In the reaction,


The product C is

• acetaldehyde

• acetylene

• ethylene

• ethylene