81.

A fruity smell is produced by the reaction of C₂H₅OH with

• CH₃COCH₃

• CH₃COOH

• PCl₅

• CH₃CHO

When dihydroxy acetone reacts with HIO₄, the product is/ are

• HCHO

• HCOOH

• HCHO and HCOOH

• HCHO and CO₂

Which of the following molecules has trigonal planar geometry?

• IF₃

• PCl₃

• NH₃

• BF₃

The correct sequence of increasing covalent character is represented by

• LiCl < NaCl < BeCl₂

• BeCl₂ < NaCl < LiCl

• NaCl < LiCl < BeCl₂

• BeCl₂ < LiCl < NaCl

Which of the following would have a permanent dipole moment?

• BF₃

• SiF₃

• SF₄

• XeF₄

Which one of the following oxides is expected to exhibit paramagnetic behaviour?

• CO₂

• SO₂

• ClO₂

• SiO₂

Which of the following is the correct increasing bond order for the given diatomic species?

• $\mathrm{NO}<{\mathrm{O}}_2^{-}<{\mathrm{C}}_2^{2-}<{\mathrm{He}}_2^{-}$

• ${\mathrm{C}}_2^{2-}<{\mathrm{He}}_2^{2+}<{\mathrm{O}}_2^{-}<\mathrm{NO}$

• ${\mathrm{He}}_2^{+}<{\mathrm{O}}_2^{-}<\mathrm{NO}<{\mathrm{C}}_2^{2-}$

• ${\mathrm{O}}_2^{-}<\mathrm{NO}<{\mathrm{C}}_2^{2-}<{\mathrm{He}}_2^{+}$

The geometry of Ni(CO)₄ and Ni(PPh₃)₂Cl₂ are:

• both square planar

• tetrahedral and square planar respectively

• both tetrahedral

• square planar and tetrahedral respectively

With which of the given pairs CO₂ resembles ?

• HgCl₂, C₂H₂

• HgCl₂, SnCl₄

• C₂H₂, NO₂

• N₂O, NO₂

The dipole moment of HBr is 2.60 x 10^-30 Cm and the interatomic spacing is 1.41 $\stackrel{\circ }{\mathrm{A}}$ .The percent ionic character of HBr is:

• 11.5%

• 10.1%

• 8.2%

• 4.1%