A carbon compound 'P' on heating with excess conc. H, So, forms another carbon compound 'Q' which on addition of hydrogen in the presence of nickel
catalyst forms a saturated carbon compound 'R'. One molecule of 'R' on
combustion forms two molecules of carbon dioxide and three molecules of water.
Identify P, Q and R and write chemical equations for the reactions involved.​

Explanation:

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b. acid is the correct answer @jayxboof all social media

acid : acids are those which accepts an electron-pairs.

base : bases are those which donates ab electron-pairs.

alkali : it is a base that dissolves in water. it is basically a base and the ph greater than 7.

hydroxide ion : it is a poly-atomic ion which is negatively charged.

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