<p>Four students observed the colour and odour of acetic acid and its reaction with sodium hydrogencarbonate. They tabulated their observations as given below.<table class=table table-bordered"><tbody><tr><td>Student<br></td><td>Colour of acetic acid</td><td>Odour of acetic acid</td><td>Action with sodium hydrogencarbonate</td></tr><tr><td><p>A</p><p>B</p><p>C</p><p>D</p></td><td><p>blue</p><p>colourless</p><p>light green</p><p>light brown</p></td><td><p>fruity</p><p>smell of vinegar</p><p>odourless</p><p>rotten eggs</p></td><td><p>gas evolves without bubbles</p><p>effervescence</p><p>gas evolves without bubbles</p><p>effervescence</p></td></tr></tbody></table><p>The correct set of observation is that of student:<br><b>(1)</b>A <b>(2)</b> B<br><b>(3)</b>C <b>(4)</b> D</p>"