41.

Which of the following radicals will not be precipitated by passing H₂S in concentrated acid solution?

• Copper

• Antimony

• Arsenic

• Cadmium

In which of the following solvents, AgBr will have the highest solubility?

• 10^-3 M NaBr

• 10^-3 M NH₄OH

• Pure water

• 10^-3 M HBr

Which of the following compounds is oxidised to prepare methyl ethyl ketone?

• 2-propanol

• 1-butanol

• 2-butanol

• t-nutyl alcohol

Identify Z in the following series

C₂H₅OH $\stackrel{{\mathrm{PBr}}_3 }{\to } \mathrm{X} \stackrel{\mathrm{alc}. \mathrm{KOH}}{\to } \mathrm{Y}\hspace{0.17em}\underset{\left(\mathrm{ii}\right) {\mathrm{H}}_2\mathrm{O}, \mathrm{Heat}}{\overset{\left(\mathrm{i}\right) {\mathrm{H}}_2{\mathrm{SO}}_4}{\to }} \mathrm{Z}$

• CH₂ = CH₂

• CH₃-CH₂OH

• CH₃-CH₂-O-CH₂-CH₃

• None of the above

Base catalysed aldol condensation occurs with

• benzaldehyde

• 2-methyl propionaldehyde

• 2, 2-dimethyl propionaldehyde

• None of the above

Mark the correct statement.

• Methylamine is slightly acidic

• Methylamine is less basic than NH₃

• Methylamine is stronger base than NH₃

• Methylamine forms salt with alkalies

Which of the following statements about vitamin B₁₂ is incorrect?

• It has a cobalt atom.

• It also occurs in plants.

• It is also present in rain water.

• It is needed for human body in very small amounts.

Which of the following food-stuffs contains nitrogen?

• Carbohydrates

• fats

• Proteins

• None of these

Glucose is obtained from

• Starch

• Molasses

• Both (a) and (b)

• None of these

Which among the following represents an amide?