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The number of pi- electrons present in c...

The number of `pi-` electrons present in cyclobutasdienyl anion `(C_4H_4)^2 -` is:

A

8

B

6

C

4

D

2

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The correct Answer is:
B
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MBD PUBLICATION-ORGANIC CHEMISTRY : SOME BASIC PRINCIPLES AND TECHNIQUES-QUESTION TYPE
  1. Which of the following will have least hindered rotation about C-C bon...

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  2. The strongest base and nucleophile among the following is:

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  3. The number of pi- electrons present in cyclobutasdienyl anion (C4H4)^2...

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  4. Removal of hydrogen atom is easier when it is attached to:

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  5. Unpaired electron in CH3 occupies:

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  6. Which one of the following will most readily be dehydrated in acidic c...

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  7. Dichloro ethylene shows:

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  8. "The negative part of the addendum adds on the carbon atom joined to t...

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  9. The production of an optically active compound from a symmetric molecu...

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  10. Heterolysis of propane gives:

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  11. Which one of the following is found in alkenes ?

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  12. The maximum number of positional isomers for an alkene with molecular...

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  13. The process of separation of racemic mixture into d- and l-enantiomers...

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  14. In which of the following species the central carbon atom is negativel...

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  15. The number of different substitution products possible when ethane is ...

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  16. Which of the following contains only three pairs of electrons ?

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  17. Which of the following is optically active?

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  18. Which group has the maximum -I effect ?

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  19. The isomeric cis-2-butene and trans-2-butene can be distinguished on t...

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  20. Zero inductive effect is shown by:

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