Question

Identify the compound which can exhibit cis-trans isomerism (A) 1,1-dichloro cyclobutane (B) 1,3-pentadiene (C) 2-chloro 1,1-dimethyl cyclo propane (D) Malonic acid​

Answer 1

Answer:

a-dichloro cyclobutane (B)

Answer 2

Answer:

1,3-pentadiene can exhibit cis-trans isomerism

Explanation:

• Geometrical isomerism, or cis and transforms, is observed in compounds with each doubly bonded carbon attached to two different groups (such as Cab=Cab, Cab=Ccd). The restricted rotation of the double bond causes geometrical isomerism.
• Despite the fact that triple bonds have limited rotation, alkynes do not exhibit geometrical isomerism because the triply bonded carbons are only attached to one group each.
• Alkenes and cyclic compounds can exhibit cis-trans isomerism.

1,3-pentadiene, $H_2C=CH–CH=CH-CH_3$with two isomers:

• cis-1,3-pentadiene.
• trans-1,3-pentadiene, or piperylene.

Maleic acid is the cis isomer of butenedioic acid.