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Electrophiles are electron seeking species. Which of the following groups contain only electrophiles?
(i) \[\ce{BF3, NH3, H2O}\]
(ii) \[\ce{AlCl3, SO3, NO^{+}2}\]
(iii) \[\ce{NO^{+}2, CH^{+}3, CH3 - \overset{+}{C} = O}\]
(iv) \[\ce{C2H^{-}5, \overset{\bullet}{C2}H5, C2H^{+}5}\]
Concept: undefined >> undefined
Which of the following pairs are not functional group isomers?
| I. | \[\begin{array}{cc} \phantom{.......................}\ce{O}\\ \phantom{.......................}||\\ \ce{CH3 - CH2 - CH2 - CH2 - C - H} \end{array}\] |
| II. | \[\begin{array}{cc} \phantom{.................}\ce{O}\\ \phantom{.................}||\\ \ce{CH3 - CH2 - CH2 - C - H} \end{array}\] |
| III. | \[\begin{array}{cc} \ce{CH3 - CH2 - C - CH2 - CH3}\\ \phantom{}||\\ \phantom{}\ce{O} \end{array}\] |
| IV. | \[\begin{array}{cc} \ce{CH3 - CH - CH2 - C - H}\\ \phantom{...}|\phantom{............}||\phantom{}\\ \phantom{...}\ce{CH3}\phantom{.........}\ce{O}\phantom{} \end{array}\] |
(i) II and III
(ii) II and IV
(iii) I and IV
(iv) I and II
Concept: undefined >> undefined
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Nucleophile is a species that should have:
(i) A pair of electrons to donate
(ii) Positive charge
(iii) Negative charge
(iv) Electron-deficient species
Concept: undefined >> undefined
Consider structures I to VII and answer the question:
| I. | CH3 – CH2 – CH2 – CH2 – OH |
| II. | \[\begin{array}{cc} \ce{CH3 - CH2 - CH - CH3}\\ \phantom{.....}|\\ \phantom{.......}\ce{OH} \end{array}\] |
| III. | \[\begin{array}{cc} \phantom{...}\ce{CH3}\\ \phantom{}|\\ \ce{CH3 - C - CH3}\\ \phantom{}|\\ \phantom{..}\ce{OH} \end{array}\] |
| IV. | \[\begin{array}{cc} \ce{CH3 - CH - CH2 - OH}\\ |\phantom{........}\\ \ce{CH3}\phantom{......} \end{array}\] |
| V. | CH3 – CH2 – O – CH2 – CH3 |
| VI. | CH3 – O – CH2 – CH2 – CH3 |
| VII. | \[\begin{array}{cc} \ce{CH3 - O - CH - CH3}\\ \phantom{...}|\\ \phantom{......}\ce{CH3} \end{array}\] |
Identify the pairs of compounds which are functional group isomers.
Concept: undefined >> undefined
Consider structures I to VII and answer the question:
| I. | CH3 – CH2 – CH2 – CH2 – OH |
| II. | \[\begin{array}{cc} \ce{CH3 - CH2 - CH - CH3}\\ \phantom{.....}|\\ \phantom{.......}\ce{OH} \end{array}\] |
| III. | \[\begin{array}{cc} \phantom{...}\ce{CH3}\\ \phantom{}|\\ \ce{CH3 - C - CH3}\\ \phantom{}|\\ \phantom{..}\ce{OH} \end{array}\] |
| IV. | \[\begin{array}{cc} \ce{CH3 - CH - CH2 - OH}\\ |\phantom{........}\\ \ce{CH3}\phantom{......} \end{array}\] |
| V. | CH3 – CH2 – O – CH2 – CH3 |
| VI. | CH3 – O – CH2 – CH2 – CH3 |
| VII. | \[\begin{array}{cc} \ce{CH3 - O - CH - CH3}\\ \phantom{...}|\\ \phantom{......}\ce{CH3} \end{array}\] |
Identify the pairs of compounds that represents position isomerism.
Concept: undefined >> undefined
Consider structures I to VII and answer the question:
| I. | CH3 – CH2 – CH2 – CH2 – OH |
| II. | \[\begin{array}{cc} \ce{CH3 - CH2 - CH - CH3}\\ \phantom{.....}|\\ \phantom{.......}\ce{OH} \end{array}\] |
| III. | \[\begin{array}{cc} \phantom{...}\ce{CH3}\\ \phantom{}|\\ \ce{CH3 - C - CH3}\\ \phantom{}|\\ \phantom{..}\ce{OH} \end{array}\] |
| IV. | \[\begin{array}{cc} \ce{CH3 - CH - CH2 - OH}\\ |\phantom{........}\\ \ce{CH3}\phantom{......} \end{array}\] |
| V. | CH3 – CH2 – O – CH2 – CH3 |
| VI. | CH3 – O – CH2 – CH2 – CH3 |
| VII. | \[\begin{array}{cc} \ce{CH3 - O - CH - CH3}\\ \phantom{...}|\\ \phantom{......}\ce{CH3} \end{array}\] |
Identify the pairs of compounds that represents chain isomerism.
Concept: undefined >> undefined
Compounds with same molecular formula but differing in their structures are said to be structural isomers. What type of structural isomerism is shown by
CH3 – S – CH2 – CH2 – CH3
And
\[\begin{array}{cc}
\phantom{.....................}\ce{CH3}\\
\phantom{................}/\\
\phantom{}\ce{CH3 - S - CH}\\
\phantom{...............}\backslash\\
\phantom{....................}\ce{CH3}
\end{array}\]
Concept: undefined >> undefined
Why does SO3 act as an electrophile?
Concept: undefined >> undefined
Match the terms mentioned in Column I with the terms in Column II.
| Column I | Column II |
| (i) Carbocation | (a) Cyclohexane and 1-hexene |
| (ii) Nucleophile of | (b) Conjugation of electrons of C – H σ bond with empty p-orbital present at adjacent positively charged carbon. |
| (iii) Hyperconjugation | (c) sp2 hybridised carbon with empty p-orbital |
| (iv) Isomers | (d) Ethyne |
| (v) sp hybridisation | (e) Species that can receive a pair of electrons |
| (vi) Electrophile | (f) Species that can supply a pair of electrons |
Concept: undefined >> undefined
Assertion (A): Pent- 1- ene and pent- 2- ene are position isomers.
Reason (R): Position isomers differ in the position of functional group or a substituent.
Concept: undefined >> undefined
The molecules having dipole moment are:
(i) 2,2-Dimethylpropane
(ii) trans-Pent-2-ene
(iii) cis-Hex-3-ene
(iv) 2, 2, 3, 3 - Tetramethylbutane.
Concept: undefined >> undefined
Assertion (A): The compound cyclooctane has the following structural formula: 
It is cyclic and has conjugated 8π-electron system but it is not an aromatic compound.
Reason (R): (4n + 2)π electrons rule does not hold good and ring is not planar.
Concept: undefined >> undefined
How can you apply green chemistry for the following:
To avoid use of halogenated solvents in drycleaning and that of chlorine in bleaching.
Concept: undefined >> undefined
For dry cleaning, in the place of tetrachloroethane, liquefied carbon dioxide with suitable detergent is an alternative solvent. What type of harm to the environment will be prevented by stopping use of tetrachloroethane? Will use of liquefied carbon dioxide with detergent be completely safe from the point of view of pollution? Explain.
Concept: undefined >> undefined
If 10 volumes of dihydrogen gas reacts with five volumes of dioxygen gas, how many volumes of water vapour would be produced?
Concept: undefined >> undefined
What does atomic radius and ionic radius really mean to you?
Concept: undefined >> undefined
What do you understand by isoelectronic species? Name a species that will be isoelectronic with the following atom or ion:-
F-
Concept: undefined >> undefined
What do you understand by isoelectronic species? Name a species that will be isoelectronic with the following atom or ion:-
Ar
Concept: undefined >> undefined
What do you understand by isoelectronic species? Name a species that will be isoelectronic with the following atom or ion:-
Mg2+
Concept: undefined >> undefined
What do you understand by isoelectronic species? Name a species that will be isoelectronic with the following atom or ion:-
Rb+
Concept: undefined >> undefined
