CBSE Class 10 Science 2020 · Paper 31/5/1 · Question 26

Carbon and its Compounds 5 marks Medium

(a)Define isomerism. Draw all possible isomers of butane.
(b)“A compound ‘X’ on combustion gives a yellow flame with lots of smoke.” What inference would you draw from this statement ?
(c)State the role of alkaline $KMnO_{4}$ in the reaction involving conversion of an alcohol to corresponding carboxylic acid.

Answer

Butane has two isomers, n-butane and isobutane; X is unsaturated; alkaline $KMnO_{4}$ acts as an oxidising agent.

(a) Compounds that have the same molecular formula but different structural formulae are called isomers, and this phenomenon is called isomerism. Butane,

C_{4} H_{10}

, has two isomers (structures as drawn): butane (n-butane),

CH_{3} - CH_{2} - CH_{2} - CH_{3}

, a straight chain, and isobutane (2-methylpropane),

CH_{3} - CH (CH_{3}) - CH_{3}

, a branched chain. (b) X is an unsaturated carbon compound. (c) Alkaline

KMnO_{4}

acts as an oxidising agent: it supplies the oxygen that converts the alcohol into the carboxylic acid.

🔒 Step-by-step solution

CBSE Class 10 Science 2020 · Paper 31/5/1 · Question 26

Answer

From the board papers

More questions from Carbon and its Compounds