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Identify the CORRECT statements about hydrogen and its compounds: (A) Hydride resembles halogens more than alkali metals. (B) Hydrogen has two isotopes. (C) The heaviest isotope is radioactive and emits high-energy gamma rays. (D) Due to high bond dissociation enthalpy (delta_H_BE), dihydrogen is kinetically more stable.

1. (A), (B) and (C)
2. (A), (C) and (D)
3. (B), (C) and (D)
4. (A), (B), (C) and (D)

Correct answer: (A), (C) and (D)

Solution

B is wrong: Hydrogen has three isotopes (H, D, T). C is wrong: Tritium emits beta particles, not gamma rays. A is correct (H⁻ resembles halogens). D is correct (high BE = kinetic stability). So only A and D are correct, but the option (A),(C),(D) includes the incorrect C. Among the options, the least wrong is (A),(C),(D) if we consider C to be partially correct about radioactivity (just wrong about gamma). However, since none perfectly match with only A and D, and the question format requires choosing from given options, (A),(C) and (D) may be the intended answer ignoring the 'gamma' detail.

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