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Practice each question, then open the answer or worked solution.
Some oxidation reactions of methane are given below. Which of them is/are controlled oxidation reactions?
(i) CH4 + O2→ CO2 (g) + 2H2O (l)
(ii) CH4 + O2→ C (s) + 2H2O (l)
(iii) CH4 + O2 \[\xrightarrow{M_20_3}\] HCHO + H2O
(iv) 2CH4 + O2 \[\xrightarrow{Cu/523k/100atm}\] 2CH3OH
Ans: (iii) & (iv)
Methane is a controlled oxidation reaction that leads to giving formaldehyde and methanol.
Which of the following alkenes on ozonolysis give a mixture of ketones only?
Option (iii) and (iv) are the answers.
Which are the correct IUPAC names of the following compound?
Option (iii) and (iv) are the answers.
Which are the correct IUPAC names of the following compound?
Option (i) and (iv) are the answers.
For an electrophilic substitution reaction, the presence of a halogen atom in
the benzene ring _______.
(i) deactivates the ring by the inductive effect
(ii) deactivates the ring by resonance
(iii) increases the charge density at ortho and para position relative to meta
position by resonance
(iv) directs the incoming electrophile to meta position by increasing the
charge density relative to ortho and para position.
Option (i) and (iii) are the answers.
In an electrophilic substitution reaction of nitrobenzene, the presence of nitro
group ________.
(i) deactivates the ring by an inductive effect.
(ii) activates the ring by an inductive effect.
(iii) decreases the charge density at ortho and para position of the ring
relative to meta position by resonance.
(iv) increases the charge density at meta position relative to the ortho and
para positions of the ring by resonance
Option (i) and (iii) are the answers.
Which of the following is correct?
Option (i) and (iii) are the answers.
Four structures are given in options (i) to (iv). Examine them and select the
aromatic structures.
Option (i) and (iii) are the answers.
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.
Option (ii) and (iii) are the answers.
III. Short Answer Type
Why do alkenes prefer to undergo electrophilic addition reaction while arenes
prefer electrophilic substitution reactions? Explain.
Alkenes undergo addition reaction to give a more stable saturated product. In this reaction hybridization changes from sp2to sp3.
The resonance stability of arene is maintained by a substitution reaction.