Nuclear Power Engineering
Fission of U-235 on slow neutron bombardment can be represented by

92U235 + 0n1 → 92U236 + 3 0n1+ Q (energy)
92U235 + 0n1 → 56Ba143 + 36Kr90
92U235 + 0n1 → 56Ba143 + 36Kr90 + 3 0n1
92U235 + 0n1 → 56Ba143 + 36Kr90 + 3 0n1 + Q (energy)

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Nuclear Power Engineering
Water is a better coolant than a gas (like CO₂, He, N₂ etc.), because it

All of these
Is a better neutron moderator as well
Has a better heat transfer characteristics, and it can be pressurised to attain a high temperature
Requires comparatively smaller pumps and heat exchanger for a given heat transfer rate

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Nuclear Power Engineering
Commercial power generation from fusion reactor is not yet possible, because

Quantity of fuel required for initiating fusion reaction is prohibitively high
It is difficult to control fusion reaction
The fuel required (e.g. deuterium and tritium) is scarce
It is difficult to initiate fusion reaction

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