MCQ
Which of the following is a disaccharide
- AGlucose
- BRibulose
- ✓Lactose
- DArabinose

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Calculate $\Delta {T_b}$ if ${K_f} = 1.86$ and ${K_b} = 0.521$.
Assertion $A$: Permanganate titrations are not performed in presence of hydrochloric acid.
Reason $R$ : Chlorine is formed as a consequence of oxidation of hydrochloric acid.
In the light of the above statements, choose the correct answer from the options given below.