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Which of the following statements is/are correct?

1. KHF2(s) exhibits strong hydrogen bonding
2. The melting point of alkaline earth metal chlorides increases in the order: BeCl2 < MgCl2 < CaCl2 < SrCl2 < BaCl2
3. The dipole moments of methyl halides follow the order: CH3-F > CH3-Cl > CH3-Br > CH3-I
4. The thermal stability of alkaline earth metal carbonates increases in the order: BaCO3 > SrCO3 > CaCO3 > MgCO3 > BeCO3

Correct answer: KHF2(s) exhibits strong hydrogen bonding

Solution

KHF2 contains F-H...F hydrogen bonds (among the strongest known), so statement A is correct. Melting points of alkaline earth chlorides do increase down the group (more ionic character), so B is correct. Dipole moments of CH3X decrease as X goes from F to I (electronegativity effect dominates), so C is correct. Thermal stability of MCO3 increases down the group (BaCO3 > SrCO3 > CaCO3 > MgCO3 > BeCO3), so D is correct.

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