Chemistry Class-11: Chapter – 13. Hydrocarbons Part – 3 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question: 14

Which are the correct IUPAC names of the following compound?

(i)

(ii)

(iii)

(iv)

Answer: (i) , (iv)

Question: 15

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.

Answer: (i) , (iii)

Question: 16

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.

Answer: (i) , (iii)

Question: 17

Which of the following are correct?

(i)

(ii)

(iii)

(iv)

Answer: (i) , (iii)

Question: 18

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

(i)

Four Structures Options (I) to (IV)

(ii)

Four Structures Options (I) to (IV)

(iii)

Four Structures Options (I) to (IV)

(iv)

Four Structures Options (I) to (IV)

Answer: (i) , (iii)

Question: 19

The molecules having dipole moment are ________.

(i)

(ii)

(iii)

(iv)

Answer: (ii) , (iii)