Which among the following is a catalyst for the preparation of Grignard reagent ?

• Iron powder

• Iodine powder

• Activated charcoal

• Manganese dioxide

The chirality of the compound

• R

• S

• Z

• E

Which is not present in Grignard reagent ?

• Methyl group

• Magnesium ion

• Halogen atom

• Carboxylic group

Which ligand is useful for removal of the toxic effect of lead metal in body in chelate therapy treatment?

• AsO${}_4^{3-}$

• CH₃COO^-

• (COO^-)₂

• 

Chlorobenzene is o, p-directing in electrophilic substitution reaction. The directing influence is explained by

• +M of Ph

• +I of Cl

• +M of Cl

• -I of Ph

The end product 'C' in the following reaction-

627.

Out of

Relative stabilities order is

• 4 < 2 < 3 < 1

• 2 > 4 < 3 < 1

• 4 < 2 < 1 < 3

• 2 < 4 < 1 < 3

CH₃MgBr + CH₂ = CH-COH $\stackrel{{\mathrm{H}}_3{\mathrm{O}}^{+}}{\to }$ Product

It is (1 : 4 addition)

• CH₂=CH-$\underset{{\mathrm{CH}}_3}{\overset{\mathrm{OH}}{\underset{\left|}{\overset{\right|}{\mathrm{C}}}}}-\hspace{0.17em}\mathrm{H}$

• CH₂OH-CH=CH-CH₃

• CH₃CH₂CH₂CHO

• None of the above

Which one is least reactive in a nucleophilic substitution reaction?

• CH₃CH₂Cl

• CH₂=CHCH₂Cl

• CH₂=CHCl

• (CH₃)₃CCl

The number of moles of Grignard reagent consumed per mole of the compound

• 2

• 3

• 1

• 4