Amines

Q1.The nitrogen atom in amines is:

• Asp hybridized with linear geometry
• Bsp2 hybridized with planar geometry
• Csp3 hybridized with pyramidal geometry
• Dsp3d hybridized with trigonal bipyramidal geometry

Q2.The Balz-Schiemann reaction converts a diazonium salt to an aryl fluoride. What reagent is used?

• AHF (hydrofluoric acid)
• BCuF (cuprous fluoride)
• CHBF4 (fluoroboric acid) — the diazonium fluoroborate is decomposed on heating
• DNaF (sodium fluoride)

Q3.Reduction of which compound gives a primary amine with one more carbon than the starting material?

• ANitro compound
• BAmide
• CNitrile (cyano compound)
• DQuaternary ammonium salt

Q4.Benzene diazonium chloride reacts with phenol in alkaline medium to form a dye. What is the structure of this azo compound?

• AC6H5–OH (phenol unchanged)
• BC6H5–N=N–C6H4–OH (4-hydroxyazobenzene or p-hydroxyazobenzene)
• CC6H5–NH–NH–C6H5 (hydrazobenzene)
• DC6H5–O–C6H5 (diphenyl ether)

Q5.Which test distinguishes between primary, secondary and tertiary amines using all three possible outcomes?

• ATollens' test
• BHinsberg test with benzenesulphonyl chloride
• CCarbylamine test
• DIodoform test