Diborane reacts with ammonia under different conditions to give a variety of products. Which one among the following is not formed in these reactions?
B2H6 2NH3
B12H12
B3N3H6
(BN)n
Diels-Alder reaction will not take place with which of the following reactants?
A.
In Diels-Alder reaction,conjugated dienes react with enes or olefinic compounds and give cycloalkenes.
Since, (buta-1,4,hene) is not a conjugated alkene, it will not take part in Diels-Alder's reaction.
In which of the following, ortho/para substitution by an electrophile is very facile?
Ntrobenzene
Phenol
Benzoic acid
Acetophenone
Reduction of nitrobenzene with Zn and alcoholic KOH solution results in the formation of the following compound.
hydrazobenzene
azobenzene
aniline
phenylhydroxylamine
A solution of concentration C g equiv/L has a specific resistance R. The equivalent conductance of the solution is
R/C
C/R
1000/RC
1000R/C
Assertion (A): White tin is an example of tetragonal system.
Reasoning (R): For a tetragonal system a= b = c and α = β = γ ≠ 90°. The correct answer is
(A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are true and (R) is not the correct explanation of (A).
(A) is true but (R) is not true.
(A) is not true but (R) is true.
What is the slope of the straight line for the graph drawn between ln k and 1/T, where k is the rate constant of a reaction at temperature T?
-Ea/ 2.303R
-Ea/R
Ea/R
R/Ea