Question

اولا Problem 1: Are the following alkenes circle the carbon-carbon double bond and clearly indicate if the alkene is cis, trans or neither? کہا کہ گا ) H CH3 C=C CHg H Problem 2: Use the labels E and Z to best describe the stereochemistry of the alkenes below. OH NH2 H2N OH Problem 3: Using IUPAC rules name the following molecules. لہ لہ مہم

question 1,2 and 3

Answer 1

Problem 1 : We have to tell which alkane is cis or trans or neither in nature. Cis alkene major group are on same side while in trans alkenes, major group that attached to alkene are opposite to each other.

Problem 2: We have to configure alkene E and Z. For that we have to first indicate the priority groups that are attached to alkene. Group will higher atomic mass will be prioritized first. If the priority groups are attached on same side then it is Z and if priority groups are attached on different sides then it is E.

Problem 3: We have to write IUPAC name which is done by giving number to the longest chain containing major group. Although we don't require to write classification of alkene in IUPAC but still we can write just for indication. We have answer:-

froblem 1:0 LH as - Cis-alkene Same side major group are ? cis or trans So answer It cannot be is neither - as major gezoopare sane Cis- olkene sidled → It cannot be either Same groups ose cis ac trans attached on as all 4 - Sides - - It is Cis-albene __ on same side major groups OH ILE It is group terens alkene as mejor are on opposite side → It is trans alkene care opposite major group

~ It is cis- alkene as major group ore opposite It cannot be either cis or trans because we have some environment around all clirection : PROBLEM 21 . Check - Major groups on some side _ so it is 'z? ani - CH₃ .. NH2 I Priority so groups it is are E opposite Bro _ Priority are opposite groups E Je so it is

to Toulority groups Be opposite each other . So it is PROBLEN 3 6 a - Hex-2-ene ý trans- Hex-2, 4-diene cis- hex-2,4-diene 7 2 . 4-methyl-hex-2-ene 3