Ncert Solutions Chemistry Class 11th

Four structures are given in options (i) to (iv). Examine them and select the aromatic structures.

(i) CH₃—O—CH₂^⊕ is more stable than CH₃—CH₂^⊕

(ii) (CH₃)₂CH^⊕ is less stable than CH₃—CH₂—CH₂^⊕

(iii) CH₂=CH—CH₂^⊕ is more stable than CH₃—CH₂—CH₂^⊕

(iv) CH₂=CH^⊕is more stable than CH₃—CH₂^⊕

In an electrophilic substitution reaction of nitrobenzene, the presence of nitro group ________. 

(i) Deactivates the ring by inductive effect. 

(ii) Activates the ring by 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

For an electrophilic substitution reaction, the presence of a halogen atom in the benzene ring _______. 

(i) Deactivates the ring by 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.

Which are the correct IUPAC names of the following compound?

Which are the correct IUPAC names of the following compound?

(i) 5– Butyl – 4– isopropyldecane

(ii) 5– Ethyl – 4– propyldecane

(iii) 5– sec-Butyl – 4– iso-propyldecane

(iv) 4–(1-methylethyl)– 5 – (1-methylpropyl)-decane

Which of the following alkenes on ozonolysis give a mixture of ketones only?

In the following questions two or more options may be correct.

(i) CH₄ + O₂ → CO₂ (g) +  2H₂O (l)

(ii) CH₄ + O₂ → C (s) +  2H₂O (l)

(iii) CH₄ + O₂   HCHO +  H₂O   

(iv) 2CH₄ + O₂2CH₃OH

Which of the following reactions of methane is incomplete combustion:

(i) 2CH₄ + O₂ 2CH₃OH

(ii) CH₄ + O₂ HCHO +  H₂O   

(iii) CH₄ + O₂ → C (s) +  2H₂O (l)

(iv) CH₄ + O₂ → CO₂ (g) +  2H₂O (l)

Arrange the following alkyl halides in decreasing order of the rate of β– elimination reaction with alcoholic KOH.

 (B) CH₃—CH₂—Br

 (C) CH₃—CH₂—CH₂—Br

(i) A > B > C 

(ii) C > B > A 

(iii) B > C > A 

(iv) A> C > B