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JEE Advanced levelSingle correct optionDifficulty 3 of 3qa201

Assertion (A): The green flame test for borate is performed with ethanol (or methanol) and conc. , not with dilute acid. Reason (R): Formation of the volatile borate ester from boric acid and the alcohol is a condensation that needs a dehydrating medium.

  1. ABoth A and R are true and R is the correct explanation of A
  2. BBoth A and R are true but R is not the correct explanation of A
  3. CA is true but R is false
  4. DA is false but R is true

Answer: A

is an esterification equilibrium, which is driven forward by the water-absorbing conc. . Dilute acid would supply water and shift it back. Both A and R are true and R explains A.
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