Fluorobenzene (C₆H₅F) can be synthesized in the laboratory  

1)  by direct fluorination of benzene with F2  gas  
2)  by reacting bromobenzene with NaF solution  
3)  by heating phenol with HF and KF
4)  from aniline by diazotisation followed by heating the diazonium salt with HBF₄
   

The conversion of A --> B follows a third order kinetics. Doubling the one of A will increase the rate of formation of B by a factor of

 1. 6
 2. 1/6
 3. 8
 4. 1/8

The increasing order of the first ionization enthalpies of the elements B, P, S and F (Lowest first) is 

1)  B < P < S < F  
2)  B < S < P < F  
3)  F < S < P < B  
4) P < S < B < F
   

Copper has face-centered cubic (fcc) lattice with interatomic spacing equal to 2.54. The value of lattice constant for this lattice is:

1) 3.59 A
2) 2.54 A
3) 1.27 A
4) 5.08 A

In which of the following compounds iron has lowest oxidation state 

Acetylene molecule, the two carbon atoms are linked by

1) One sigma bond and two pi-bonds
2) Two sigma bonds and one pi-bond
3) Three sigma bonds
4) Three pi-bonds

?E° of combustion of iso-butylene is -X kJ mol ^-1 . The value of ?H° is

1) = ?E°
2) > ?E°
3) = 0
4) < ?E°

A solution contains a mixture of Ag⁺ (0.10 M) and Hg₂²⁺ (0.10 M) which are to be separated by selective precipitation. Calculate the maximum concentration of iodide ion at which one of them gets precipitated almost completely. What % of that metal ion is precipitated?

Ksp of AgI = 8.5 × 10^–17and Ksp of Hg₂I₂ = 2.5 × 10^–26

1)  0.17%
2)  9.983% 
3)  83%.
4)  99.83%

Identify C in the following reaction,

1) Benzamide
2) Benzoic acid
3) Chlorobenzene
4) Aniline

A first order reaction was started with a decimolar solution of the reactant. 8 minutes and 20 seconds later its concentration was found to be M/100. So the rate constant of the reaction is

1) 2.303 × 10^-5/sec
2) 5 × 10^-3 /sec
3) 2.303 × 10^-4/sec
4) 4.606 ×  10^-3/sec