21.

The reaction of zinc with dilute and concentrated nitric acid, respectively, produces:

• NO₂ and NO

• NO and N₂O

• NO₂ and N₂O

• NO₂ and N₂O

Galvanization is applying a coating of:

• Cr

• Cu

• Zn

• Zn

2-chloro-2-methylpentane on reaction with sodium methoxide in methanol yields:

• Both a and c

• Only c

• Both a and b

• Both a and b

Which of the following statements about low-density polythene is false?

• It is a poor conductor of electricity

• Its synthesis requires dioxygen or a peroxide initiator as a catalyst.

• It is used in the manufacture of buckets, dustbins etc.

• It is used in the manufacture of buckets, dustbins etc.

Which of the following is an anionic detergent?

• Sodium lauryl sulphate

• Cetyltrimethyl ammonium bromide

• Glyceryl oleate

• Glyceryl oleate

The absolute configuration of

is:

• (2S, 3R)

• (2S, 3S)

• (2R, 3R)

• (2R, 3R)

Thiol group is present in:

• Cystine

• Cysteine

• Methionine

• Methionine

In the Hofmann bromamide degradation reaction, the number of moles of NaOH and Br₂ used per mole of amine produced are:

• Four moles of NaOH and two moles of Br₂

• Two moles of NaOH and two moles of Br₂

• Four moles of NaOH and one mole of Br₂

• Four moles of NaOH and one mole of Br₂

The reaction of propene with HOCl(Cl₂+H₂O) proceeds through the intermediate:

• CH₃−CH⁺−CH₂−Cl

• CH₃−CH(OH)−C⁺H₂

• CH₃−CHCl−C⁺H₂
  

• CH₃−CHCl−C⁺H₂
  

The product of the reaction given below is: