Draw the structure of the isomers of c6h11br that contains a 5-membered ring and is least reactive in an sn1 reaction.

We have to know the structure of the isomer of C₆H₁₁Br which contains 5-membered ring and is least reactive in an SN¹ reaction.

The structure is: isomer (a) shown in figure where methyl group and Br atom connected to the adjacent carbons in the ring.

There are four isomers possible with molecular formula C₆H₁₁Br. Those are shown in figure as (a), (b), (c), (d).

SN¹ reaction takes place through carbocation  intermediate formation. If carbocation is more stable, SN¹ reaction will be more faster and if carbocation is not stable, SN¹ reaction will be slower.

The stability of carbocation depends on number of α-H atoms. If the number of α-H atom is more, hyperconjugation in the carbocation will be more; as a consequence, SN¹ reaction rate will be faster.

On the other hand, if the number of α-H atom is less, hyperconjugation in the carbocation will be less; as a consequence, SN¹ reaction rate will be slow.

The carbocation of isomer (a) contains  α-H atom= 3, all other isomers contain minimum 4 α-H atoms.

Calcium (Ca)(On the periodic table, ionization energy increases as you go up and to the right of the periodic table)

glycoproteins

Explanation:

A positive reaction for Molisch's test is given by almost all carbohydrates (exceptions include tetroses & trioses). It can be noted that even some glycoproteins and nucleic acids give positive results for this test (since they tend to undergo hydrolysis when exposed to strong mineral acids and form monosaccharides).