Question

(i) Acetylene is acidic but it does not react with NaOH or KOH. Give reason.

(ii) Name an alkane and alkene which are isomeric.

(iii) Why alkynes do not show geometrical isomerism

(iv) What types of hybridisation is involved in (a) planar and (b) linear molecules

Answer 1

(i) Since acetylene is very weak acid Ka 10-25, therefore, it does not react with NaOH or KOH.

(ii) Cyclohexane (C₆H₁₂) and hexene (C₆H₁₂) are isomeric.

(iii) Alkynes have linear shape and therefore, don not show geometric isomerism. 

(iv) (a) sp² 

(b) sp