Question

5) Assign E or Z of the following molecules: OHC Đi sâu енен, Which of the following compounds can exist as pairs of cis-trans CH3)-C=CHCH & CHỤCH=CH, (c) QH,CH=CHCH CAT=a cho anh chc=0CH, 7) Assign the type of isomerism of the following pairs: OH CH3-CO CH, COOE CH-C-CHCOOE: a) Structure Position ition Functunal 8) Write the possible skeletal isomers of the following alkane: CsH12

Answer 1

OHC (13) HOOL, 63 & are some nic "CHE on Left side same groups are present, so no cis-trans possible So no is trans are possible (C) CH₂ CH = CH CH3 Cis trans are possible: Ⓡycc@ Left side, both groups are some, so no as-trans. possible. trons

5) (a) is E and b is Z

out of two different groups on each Carbon, higher priority group has been marked as (1) and lower as(2) . The priority is given by looking at the atom directly attached to double bonded carbon. If directly attached atom is same then look for the next atom attached to it . In given example:

(a) on left side chlorine is given priority over Carbon and on right side priority is given to iso-propyl over ethyl. Thus higher priority groups are on opposite sides, so it's (E)

(b) on left Bromine has priority over Carbon and on right oxygen over Carbon. Higher priority groups on same side, so it's (Z).

6) (c)

For an alkene to have cis trans forms, each Carbon of alkene should be attached to two different groups.

7)

(9) Chain isomers] They differ in position / Arrangement of ce H-ators only. cyclohexane Methyl cyclopent one ) Functional ipomens } unctiona 'да Менд They have different functional groups. Cyclo but an ol (Alcohol) Tetrahy cco fu ran (Ether) - e - and set the 8th cocort Cenol ester) Ethylauto austate sketo ester) These are tauto Mens

These are examples of constitutional (structural) isomers that have same molecular formula but different arrangement of atoms. Constitutional isomers are further divided in chain, functional, position isomers and tautomers. So these are:

a) chain isomers

b) functional isomers

c) tautomers (easily interconvertible)

8) three structural isomers of C5H12 possible:

.Hi2 8 - CHz 59359 Isopentane neobentane or Or n-pentane d-methyl-bestane 2,2-dimethylpropane