Which is more nucleophilic than the other of the following compounds?
P. (X) R2N- (Y) R-O- (Z) F-
Q. (X) R-S- (Y) Cl-
R. (X) R-S- (Y) R-O-
S. (X) R-OH (Y) R-SH
T. (X) OH- (Y) -O-O-H
U. (X) NH3 (Y) H2N-NH2
Nucleophilicity increases with the increase in the size of atom in the same period and decreases with the increase in electronegativity.
The correct order of the pKa values for the conjugate acids of heterocyclic compounds given below is:
Basicity: Electron pair donating ability
Delocalised lone pair present on nitrogen which has the lowest basicity.
Pyridine has poor basic character. In pyridine, lone pair present on the nitrogen atom are perpendicular
to the orthogonal orbital, containing sp2 hybrid orbital.
(Aziridine having more s% character than pyrrolidine. so, pyrrolidine is more basic than Aziridine).
So, the correct order of pka value.
Pick out the incorrect statements:
The correct order of pKa for the following compounds is:
Consider the following reaction sequence:
Product (P) and (Q) are made to react with sodium amide to yield R and S respectively. Identify the correct statement.
Consider the bonds marked as (A), (B), (C) and (D) in the following structures.
What is the correct order of their homolytic bond dissociation energies?
The correct order of dipole moment in pyrrole, thiophene and furan respectively, is:
There are three major factors contributing to the overall dipole moments:
(i) The σ bond dipole associated with C-0 and C—N bonds.
(ii) The π bond dipole associated with the delocalisation of π electrons from the heteroatom to the ring.
(iii) The dipole moment associated with the unshared electron pair (for 0) or N—H bond (for N).
The rotational energy barrier along 1-2 bond will be the lowest in:
Lone pair not available for delocalization into benzene ring.
The compound with lowest heat of combustion will be:
More stable olefin will have lesser heat of hydrogenation and lesser heat of combustion.
Consider the following reactions,
A boy is said to choose one entity from product P, Q, R and S. What is the probability that the chosen compound will be antiaromatic? (Answer should be in decimals)
It is found that among P, Q, R and S, P and S are antiaromatic i.e.,
Given compounds A,B,C and D are subjected to IR spectrum analysis. compounds which will show minimum and maximum vco streching frequency in IR respectively will be:
If polarity of solvent is sufficiently increased, then what will happen?
Consider the following sequence of reaction,
B on reaction with Na in presence of FeCl2 gives a well known organometallic compound C. Identify the correct statement about above reaction sequence.
From the above reaction sequence, it is clear that A and B not an aromatic compound, whicle C which is ferrocene is a well know aromatic compound
Among the pairs given below, identify the most acidic compound.
Generally, cis acid are more acidic than trans acid, if group are small.
(Y) due to the presence of methyl group ortho to carboxylate ion. which are perpendicular to phenyl ring. So. carboxylate group not in conjugate with phenyl ring. Hence. carboxylate negative ion having more conjugation. So. (Y) is more acidic in nature
Presence of electron releasing group, decreases the stability of negative charged conjugate base. So, less acidic
The number of anti-aromatic systems present among the following compounds is/are _____________(Answer should be an integer)
B, E, F, G and I are anti-aromatic in nature
Among the following, how many are aromatic in nature? (Answer should be an integer)
B, D, H aromatic in nature
The number of aromatic compound among the following will be: (Answer should be an integer)
No such driving force for delocalization present in (d) and (e)
What is the sequence of reagents that will accomplish the synthesis of the following aromatic amine from benzene?
Electrophilic Aromatic Substitution of the methyl group with lewis acid leads to toluene. Through nitration, the nitro group is added then the reduction of nitro group leads to the amine.
In the following compounds, how many pairs of compounds having correct order w.r.t mentioned properties? (Answer should be an integer)
In the following compounds, how many compounds having more pKa value relative to the H2O? (Answer should be an integer)
H2O = pKa value 15.74 (more pka value than H20 means less acidic than H20)
Compounds C,E,F,G having more pKa value than H20