11.

Cyclopentadienyl anion is

• benzenoid and aromatic

• non-benzenoid and aromatic

• non-benzenoid and non-aromatic

• non-benzenoid and anti- aromatic

Balance the following equation by chossing the correct options: 

xKNO₃ + yC₁₂H₂₂O₁₁ → pN₂ + qCO₂ + rH₂O + sK₂CO₃

• x	y	p	q	r	s
  36	55	24	24	5	48

• x	y	p	q	r	s
  48	5	24	36	55	24

• x	y	p	q	r	s
  24	24		55	48	5

• x	y	p	q	r	s
  24	48	36	24	5	55

The set representing the right order of ionic radius is

• Li⁺ > Na⁺> Mg²⁺ > Be²⁺

• Mg²⁺ > Be²⁺> Li⁺> Na⁺

• Na⁺> Mg²⁺> Li⁺> Be⁺

• Na⁺> Li⁺> Mg²⁺> Be⁺

The reactivity of alkyl bromides.

Towards iodide ion in dry acetone decrease in the order

• V > I > II > III

• I > IV> II> III

• III> II> I> I

• III > II > IV > I

Optically active CH₃—CH₂—CHOH—CH₃ was found to have lost its optical activity after standing in water containing a few drops of acids, mainly due to the formation of 

• CH₃—CH₂—CH=CH₂
  

• CH₃—CH=CH—CH₃

• CH₃—CH(CH₃)—CH₂—OH

• CH₃—CH₂—CH₂—CH₂—OH

The bonding in diborane (B₂H₆) can be described by

• 4 two centre - two electron bonds and 2 three - centre- two electron bonds

• 3 two centre - two electron bonds and 3 three - centre- two electron bonds

• 2 two centre - two electron bonds and 4 three centre - two electron bonds

• 4 two centre - two electron bonds and 4 two- centre- two electron bonds

The element that forms stable compounds in low oxidation state is

• Mg

• Al

• Ga

• Tl

Atomic radius (pm) of Al, Si,N and F respectively is:

• 117, 143, 64, 74

• 143, 117, 74, 64

• 143, 47, 64, 74

• 64, 74, 117, 143

Reaction of calgon with hard water containing Ca²⁺ ions produce

• [Na₂CaP₆O₁₈]^2-

• CaCO₃

• CaSO₄

• Ca₂(PO₄)₃

Which of the following elements lowest melting point?

• Sn

• Pb

• Si

• Ge