Chemistry Class-11: Chapter –13. Hydrocarbons Part – 7

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Question: 38

Which of the following compounds are aromatic according to Huckel’s rule?

(A)

Aromatic according to Hickel's rule

Huckel’s Rule

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(B)

Aromatic according to Hickel's rule

Huckel’s Rule

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(C)

Aromatic according to Hickel's rule

Huckel’s Rule

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(D)

Aromatic according to Hickel's rule

Huckel’s Rule

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(E)

Aromatic according to Hickel's rule

Huckel’s Rule

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(F)

Aromatic according to Hickel's rule

Huckel’s Rule

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Answer:

Has electrons, does not follow Huckel rule. Orbitals of one carbon atom are not in conjugation. It is not aromatic.

Has delocalised electrons. Hence, is aromatic.

Has 6π electrons in conjugation but not in the ring. Non aromatic.

electrons in planar rings, aromatic.

Out of electrons it has delocalised 6π electrons in one six membered planar ring, which follows Huckel’s rule due to which it will be aromatic.

Electrons are in conjugation and are present in a ring. Huckel’s rule is being followed. Compound will be aromatic if ring is planar.

Question: 39

Suggest a route to prepare ethyl hydrogensulphate starting from ethanol.

Answer:

IV. Matching Type

Question: 40

Match the reagent from Column I which on reaction with gives some product given in Column II as per the codes given below:

Match the reagent from Column I which on reaction with CH_3 —CH=CH_2 gives some product given in Column II as per the codes given below:

Column I

Column II

(i)

(a)

Acetic acid and

(ii)

(b)

Propan-1-ol

(iii)

(c)

Propan-2-ol

(iv)

(d)

Acetaldehyde and formaldehyde

(v)

(e)

Propan-1-2-diol

Answer:

(i) → (d) (ii) → (a) (iii) → (e) (iv) → (c) (v) → (b)

Question: 41

Match the hydrocarbons in Column I with the boiling points given in Column II.

Match the hydrocarbons in Column I with the boiling points given in Column II.

Column I

Column II

(i)

(a)

(ii)

(b)

(iii)

(c)

Answer:

(i) → (b) (ii) → (c) (iii) → (a)

Question: 42

Match the following reactants in Column I with the corresponding reaction products in Column II.

Match the following reactants in Column I with the corresponding reaction products in Column II.

Column I

Column II

(i)

(a)

Benzoic acid

(ii)

(b)

Methyl phenyl ketone

(iii)

(c)

Toluene

(d)

Chlorobenzene

(e)

Benzene hexachloride

Answer:

(i) → (d) (ii) → (c) (iii) → (b) (iv) → (a)