Question

a. For each pair of compounds, tell whether the structural formulas shown represent the same compound, different compounds that are constitutional isomers or different compounds that are not constitutional isomers. [4 x 1 mark] (1) and (11) and (111) and (iv) and b. Draw a structural formula for each compound. 1 (3E, 62) 2,9-dimethyl-3,6-decadiene (i) 1,6-Heptadiyne (111) 3-phenyl-1.3-butanediol [1 mark] [1 mark] [1 mark] c. Give TWO chemical tests which are indicated by a change in colour, (write the equation involved and state the colour change) to distinguish alkene from an alkane. [2 x 1% marks] d. The molecular formula for ethyl alcohol (CH CH OH) is C H.O. What is the molecular formula for the following compounds? [2 x 1 mark] (1) (ii) OH wood OH

Answer 1

Same molecular formula, different bonch Connectivity gives 0900 rise to Constitutional isomer 10.00 0 and different isome C4 HS Cyhio and a Cy Hg - Constitutional iso mu 1.00 Cy Hg and - Constitutional isomen. 2.0 Cq Hly Cztin and > + different isomu 0.00 CG H 18 CzH6 .00 10 4 6 2 100 ch (36,677 2,9 dimethyl 3,6 decadiens 00 6 4 2 3 bo 4 DO Ph. Heffckh-C1- CHCEC-11 16 - Hepadiyne. 0 CID Cih-ch- CHCHH-OH # 3-Phenyl-1,3-butanediol. Br Br CH=CH₂ B1722 einet (Red Colour H2o of By disappeas with alkene but acidife's ott this not occurs in alkane) (Р. Purple colour or km nou dujakkeans folowtens 1 1 emember La ot 1 - 1 -KM nout SOR