If a chemical change occure A. the composition remains the same
B. there is a change in composition
C. the physical state of matter change
D. all the physical properties remain the same

When studying a Chemical Change, we can see that it does in fact alter the composition of the original matter. This means that the answer is B) there is a change in composition. For the other 3 to occur, the change would need to be a physical change, which does not change composition, does change the state of matter, but not all physical properties remain the same.

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the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.