Some basic principles of organic chemistry (GOC)

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Reaction Mechanism- Test1 Max. Marks = 40

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1. Which of the following groups has the highest +I effect ?

4 points

(A) CH₃—

(B) CH₃CH₂—

(D) (CH₃)₃C—

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2. Which of the following pairs of structures do not represent resonating structures?

4 points

(A)

(B)

(C)

(D)

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3.The o, p-directing but deactivating group is

4 points

(A) – NH₂

(B) – OH

(D) X-(Halogen)

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4. Electromeric effect is -

4 points

(A) The effect in excited state

(B) Pi electrons remain in valency shall

(D) Only Pi electrons are shifted

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5.The most stable free radical among the following is

4 points

(A)

(B)

(C)

(D)

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6. Electrophile is

4 points

(A) H₂O

(B) NH₃

(D) C₂H₅NH₂

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7. Arrange the following nucleophiles in the order of their nucleophilic strength :

4 points

(A) OH– > CH₃COO– > OCH₃– > C₆H₅O–

(B) CH₃COO– < C6H5O– < CH₃O– < OH–

(D) CH₃COO– < C₆H₅O– < OH– < CH₃O–

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8. H – C – H bond angle of singlet carbene is-

4 points

(A) ~180º

(B) ~120º

(D) ~ 90º

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4 points

(A)

(B)

(C)

(D)

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10. Which of the following will have least hindered rotation about carbon-carbon bond ?

4 points

(A) Ethane

(B) Ethylene

(D) Hexachloroethane

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