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Problems: Structure of Alkanes

Problem : How many isomers are there for the molecular formulas below? (a) C 4 H 8
(b) C 3 H 4

Draw the isomers, including both constitutional isomers and stereoisomers.

(a)Since C 4 H 8 follows the general formula C n H 2n , it must contain either a double bond or a ring. (b) The unsaturation number of C 3 H 4 = 2 . It therefore contains either one triple bond, or one ring and one double bond, or two double bonds. There aren't enough C's to form two rings.

Problem : Identify whether the alkanes below are identical to A, an isomer of A, or neither.

(a) isomer (b) identical (c) neither (d) neither

Problem : Give IUPAC names for the following molecules:

(a) 3-ethylpentane
(b) 5-ethyl-2,2-dimethylnonane
(c) 3-ethyl-2-methylhexane
(d) 2,2,3,3-tetramethylpentane

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