A common application of the Cope rearrangement is in ring enlargement sequences. Identify the reagents and products missing from the following scheme, which illustrates the construction of a 10-membered ring. Clearly indicate stereochemistry by drawing a wedge bond, hashed bond and two in-plane bonds at each chiral carbon.

first one is the correct answer

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8

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substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.