C is an organic compound. Carry out the following exercises on C. Record your observations and identity any gas(es) evolved. State the conclusions you draw from the results of each test.
(a) Put about 10 drops of C on a watch glass and ignite it using a burning splint.
(b)(i) Put about 1 cm\(^3\) of C in a test tube and add about 1 cm\(^3\) of distilled water. Shake the test tube.
(ii) Put about 1 cm\(^3\) of C in a test tube and add about 2 cm\(^3\) of acidified K\(_2\)Cr\(_2\)O\(_7\) solution. Warm the mixture gently and leave to stand for 5 minutes.
(c) Put few crystals of specimen D in a test tube and add about 2cm\(^3\) of C followed by about 2 cm\(^3\) of 10 % NaOH\(_{(aq)}\) Shake the test tube vigorously.
(d) State the class of compounds to which C belongs.
(a) Put about 10 drops of C on a watch glass and ignite it using a burning splint.
(b)(i) Put about 1 cm\(^3\) of C in a test tube and add about 1 cm\(^3\) of distilled water. Shake the test tube.
(ii) Put about 1 cm\(^3\) of C in a test tube and add about 2 cm\(^3\) of acidified K\(_2\)Cr\(_2\)O\(_7\) solution. Warm the mixture gently and leave to stand for 5 minutes.
(c) Put few crystals of specimen D in a test tube and add about 2cm\(^3\) of C followed by about 2 cm\(^3\) of 10 % NaOH\(_{(aq)}\) Shake the test tube vigorously.
(d) State the class of compounds to which C belongs.
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Correct Answer: Option
Explanation:
(d) Alkanols
| Test | Observation | inference | |
| (a) | C on a water glass + burning splint | Burns with a non-Soothy/blue flame | Saturated organic compound may be present |
| (b)(i) | C + distilled water + shaking | One layer formed/miscible/viscous mixture/ C dissolved | C is soluble |
| (ii) | C + acidified K\(_2\)Cr,\(_2\)O\(_{7(aq)}\) warm and leave to stand for 5 minutes | Orange solution turns green | C is oxidized/reducing agent K\(_2\)Cr,\(_2\)O\(_{7(aq)}\) is reduced/Oxidizing agent or Primary or secondary alkanol present |
| (c) | D\(_{(s)}\) + C + NaOH\(_{(aq)}\) shaking vigorously Yellow | Yellow precipitate forms with antiseptic smell | lod foam produced |
(d) Alkanols