Chemistry Class-11: Chapter –12. The Organic Chemistry Some Basic Principles and Techniques Part – 4

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Question: 19

Which of the following pairs are position isomers?

(i) I and II

(ii) II and III

(iii) II and IV

(iv) III and IV

Answer: (ii)

Question: 20

Which of the following pairs are not functional group isomers?

(i) II and III

(ii) II and IV

(iii) I and IV

(iv) I and II

Answer: (i), (iii)

Question: 21

Nucleophile is a species that should have

(i) A pair of electrons to donate

(ii) Positive charge

(iii) Negative charge

(iv) Electron deficient species

Answer: (i), (iii)

Question: 22

Hyperconjugation involves delocalisation of ___________.

(i) Electrons of carbon-hydrogen σ bond of an alkyl group directly attached to an atom of unsaturated system.

(ii) Electrons of carbon-hydrogen σ bond of alkyl group directly attached to the positively charged carbon atom.

(iii) π-electrons of carbon-carbon bond

(iv) Lone pair of electrons

Answer: (i), (ii)

III. Short Answer Type

Note: Consider structures I to VII and answer the questions 23–26.

(I)

(II)

(III)

(IV)

(V)

(VI)

(VII)

Answer:

Question: 23

Which of the above compounds form pairs of metamers?

Question: 24

Identify the pairs of compounds which are functional group isomers.

Question: 25

Identify the pairs of compounds that represents position isomerism.

Question: 26

Identify the pairs of compounds that represents chain isomerism.

Question: 27

For testing halogens in an organic compound with solution, sodium extract (Lassaigne’s test) is acidified with dilute . What will happen if a student acidifies the extract with dilute in place of dilute ?

Answer:

White ppt. of will be formed.

Question: 28

What is the hybridisation of each carbon in .