MCQ
In pyrrole the electron density is maximum on
- A$2$ and $3$
- B$3$ and $4$
- C$2$ and $4$
- ✓$2$ and $5$
✓
Answer
Correct option: D.
$2$ and $5$
d
Pyrrole has highest electron density at $C_{2}$ and $C_{5}$ due to highest stability of protonated intermediate
Pyrrole has highest electron density at $C_{2}$ and $C_{5}$ due to highest stability of protonated intermediate
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The hydrogen-like species $\mathrm{Li}^{2+}$ is in a spherically symmetric state $\mathrm{S}_1$ with one radial node. Upon absorbing light the ion undergoes transition to a state $\mathrm{S}_2$. The state $\mathrm{S}_2$ has one radial node and its energy is equal to the ground state energy of the hydrogen atom.
→$1.$ The state $S_1$ is
$(A)$ $1 \mathrm{~s}$ $(B)$ $2 \mathrm{~s}$ $(C)$ $2 \mathrm{p}$ $(D)$ $3 \mathrm{~s}$
$2.$ Energy of the state $S_1$ in units of the hydrogen atom ground state energy is
$(A)$ $0.75$ $(B)$ $1.50$ $(C)$ $2.25$ $(D)$ $4.50$
$3.$ The orbital angular momentum quantum number of the state $S_2$ is
$(A)$ $0$ $(B)$ $1$ $(C)$ $2$ $(D)$ $3$
Give the answer question $1,2$ and $3.$
Which of the following order is incorrect ?
The correct sequence of increasing covalent character is represented by
If radius of second Bohr orbit of the $He ^{+}$ion is $105.8\,pm$, what is the radius of third Bohr orbit of $Li ^{2+}$ ion?
→The equivalent weight of a metal is $9$ and vapour density of its chloride is $59.25$. The atomic weight of metal is
→Choose the correct code of characteristics for the given order of hybrid orbitals of same atom,
$sp < sp^2 < sp^3$
$(i)$ Electronegativity $(ii)$ Bond angle between same hybrid orbitals
→$sp < sp^2 < sp^3$
$(i)$ Electronegativity $(ii)$ Bond angle between same hybrid orbitals
$(iii)$ Size $(iv)$ Energy level
Among $\left[ Co ( CN )_4\right]^{4-},[ Co ( CO ) 3( NO )], XeF _4,\left[ PCl _4\right]^{+},\left[ PdCl _4\right]^{2-},\left[ ICl _4\right]^{-},[ Cu ( CN ) 4]^{3-}$ and $P _4$ the total number of species with tetrahedral geometry is. . . . . . .
→The bond dissociation energy of $B- F$ in $BF_3$ is $646 \,kJ\, mol^{-1}$ whereas that of $C - F$ in $CF_4$ is $515\, kJ\, mol^{-1}.$ The correct reason for higher $B- F$ bond dissociation energy as compared to that of $C-F$ is
→What is the mass percent of carbon in carbon dioxide?
General electronic configuration of outermost and penultimate shell is $(n -1)\, s^2 \,(n -1)p^6(n -1)\, d^x\, ns^2$. If $n = 4$ and $x = 5$, then number of protons in the nucleus will be :-
→