Sym-cubane-d2 क्यूबेन का एक द्वि-प्रतिस्थापित आइसोटोपोमर (bi-substituted isotopomer) है, जहाँ विपरीत मुख्य-विकर्ण (body-diagonal) के कोनों पर दो हाइड्रोजन परमाणुओं को ड्यूटेरियम द्वारा प्रतिस्थापित किया जाता है। इस अणु का बिंदु समूह (point group) क्या है?

Identify the correct statement about chlorine trifluoride (ClF3) from the following options:

Assertion (A): The bond angle in water (H2O) is 104.5°, which is less than the tetrahedral angle of 109.5°, and water has a significantly higher boiling point (100°C) than hydrogen sulfide H2S (−60°C) despite H2S having a higher molecular weight. Reason (R): Oxygen in water has two lone pairs that exert greater repulsion on bonding pairs than the lone pairs of sulfur in H2S, compressing the H–O–H bond angle; additionally, the high electronegativity of oxygen (3.5) compared to sulfur (2.5) creates a large dipole moment in water, enabling extensive intermolecular hydrogen bonding that requires significantly more energy to overcome during vaporization.