question_answer

Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:

In which of the following compounds the\[\pi -\]electron cloud contains the same number of electrons (1) naphthalene               (2) anthracene (3) biphenylene                (4) phenanthrene

A)  1, 2 and 3 are correct

B)  1 and 2 are correct

C)  2 and 4 are correct

D)  1 and 3 are correct

Correct Answer: C

Solution :

                 In anthracene and phenanthrene seven double bonds are present hence they have same number of electrons, i.e.,\[7\times 2=14\text{ }\pi \] electrons.