Q.53) Which one of the following compounds cann exist as cis-trans isomers?
A) 1,2-Dimethylicyclohexane
B) Pent-1-ene
C) 2 -Methylhex-2-ene
D) 1,1-Dimethyleycloptoppane
1,2-Dimethylcyclohexane can exist as cis and trans forms due to restricted rotation in the cyclohexane ring.
Hence, the correct answer is (1)