Chemistry - STEREO ISOMERISM Question with Solution | TestHub
Total number of isomer has formula C6H10 with 3 sp3 carbon, 2 sp2 carbon, 1 sp carbon.
Answer:
Solution:
1 sp carbon i.e., 1C connected with 2 pi-bonds; 2 sp2 carbon i.e., 2C connected with 1 pi bond each; 3 sp3 carbons connected with only sigma bonds. The only skeleton fitting this is a cumulated diene (allene), C=C=C. Possible structures:
(a) hexa-1,2-diene CH2=C=CH-CH2CH2CH3 (1), (b) hexa-2,3-diene CH3-CH=C=CH-CH2CH3 - each terminal allene carbon carries two different groups (H/CH3 and H/CH2CH3), so it is axially chiral and exists as a pair of enantiomers (2), (c) 3-methylpenta-1,2-diene (1), (d) 4-methylpenta-1,2-diene (1), (e) 2-methylpenta-2,3-diene (1) - in (c), (d), (e) one terminal allene carbon carries two identical groups, so they are achiral.
Total = 1 + 2 + 1 + 1 + 1 = 6.
Ans. 6
