31.

C₂H₆ + CH₃Cl $\stackrel{\mathrm{Anhy}. {\mathrm{AlCl}}_3}{\to }$ C₆H₅CH₃ + HCl

The name of the above reaction is

• Gattermann

• Reimer-Tiemann

• Friedel-Craft

• Cannizzaro

The oxidation state of Cr in K₂Cr₂O₇ is

• +4

• +3

• +6

• +5

The tetraethyl lead mixed in petrol works as 

• cooling agent

• anti-knocking agent

• bleaching agent

• None of the above

The minimum numbers of carbon atoms in ketones which will show chain isomerism will be

• 7

• 4

• 6

• 5

The number of isomers in C₄H₁₀O are

• 7

• 8

• 6

• 5

Which of the following organic compounds could not be dried by anhydrous CaCl₂?

• Ethanol

• Benzene

• Chloroform

• Ethyl acetate

Gypsum is

• CaSO₄·H₂O

• CaSO₄·2H₂O

• 2CaSO₄·2H₂O

• CaSO₄

The number of alkenyl groups possible from C₄H₇ are

• 7

• 5

• 3

• 8

Which of the following dissolves in ionic solvents?

• C₆H₆

• CH₃OH

• CCl₄

• C₅H₁₂

Which of the following is not an iron ore?

• Malachite

• Haematite

• Siderite

• Limonite