Isomer counting for a given molecular formula including stereoisomers

13 questions on Isomer counting for a given molecular formula including stereoisomers from the Stereoisomerism chapter: 0 NEET level, 6 JEE Main, 7 JEE Advanced. Each one opens with its answer and solution.

• The compound shown is but-1-ene. Count all isomers of its molecular formula C4H8: all constitutional isomers (open-chain and cyclic) together with all geometric... JEE Main level, drawn structure
• The compound shown is pent-2-ene. How many open-chain alkenes of molecular formula C5H10 exist in total, counting constitutional isomers and geometrical isomers... JEE Main level, drawn structure
• The compound shown is 1,2-dimethylcyclopropane (no configuration specified). Count all isomers of its molecular formula C5H10: all open-chain and cyclic constit... JEE Advanced level, drawn structure
• The compound shown is 2-bromobutane. The total number of isomers of molecular formula C4H9Br, counting constitutional isomers and enantiomers separately, is JEE Main level, drawn structure
• The compound shown is one dimethylcyclohexane. Consider all constitutional isomers of dimethylcyclohexane (1,1-, 1,2-, 1,3- and 1,4-) and count every configurat... JEE Advanced level, drawn structure
• The compound shown is 2,3-dibromobutane (no configuration specified). The total number of isomers of molecular formula C4H8Br2, counting all constitutional isom... JEE Advanced level, drawn structure
• The compound shown is 1-chloroprop-1-ene (no geometry specified). Which statements about the isomers of its molecular formula C3H5Cl are correct? JEE Main level, drawn structure
• The compound shown is 1,2-dimethylcyclobutane (no configuration specified). Consider all dimethylcyclobutanes (1,1-, 1,2- and 1,3-) with the ring treated as pla... JEE Main level, drawn structure
• The compound shown is 1-chloro-2-methylcyclopropane (no configuration specified). Consider only the cyclic (ring-containing) isomers of its molecular formula C4... JEE Advanced level, drawn structure
• The compound shown is 2-chloropentane (no configuration specified). The total number of isomers of molecular formula C5H11Cl, counting constitutional isomers an... JEE Advanced level, drawn structure
• The compound shown is butan-2-ol (no configuration specified). The total number of isomers of molecular formula C4H10O (alcohols and ethers), counting enantiome... JEE Main level, drawn structure
• The compound shown is hex-3-ene (no geometry specified). How many open-chain alkenes of molecular formula C6H12 exist in total, counting constitutional isomers,... JEE Advanced level, drawn structure
• The compound shown is 2-bromo-1-chloropropane (no configuration specified). Which statements about the isomers of its molecular formula C3H6BrCl are correct? JEE Advanced level, drawn structure