Chemistry
The compound to which H2 does not add is

Biphenyl ethylene
Tetra –9 – phenanthrylethylene
Tetraphenyl ethylene
Tetra – a –naphthylethylene

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Chemistry
Table salt gets moist during rainy season because

Sodium chloride contains hygroscopic impurities like magnesium chloride
Sodium chloride contains some quantity of sodium iodide
Sodium chloride is hygroscopic
Sodium chloride is deliquescent

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