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Question:

In the scheme given above, the total number of intramolecular aldol condensation products formed from Y are:

6

7

8

2

3

5

0

4

9

1

Solution:

Ozonolysis followed by reduction of 1,2,3,4,5,6,7,8-octahydronaphthalene gives cyclodecane-1,6-dione. This on intramolecular aldol condensation gives only one product octahydroazulen-4(5H)-one.