Question

The following organic compounds cannot exist. Why?

a.$2-chloro-2-butyne$

b.$2-methyl-2-propanone$

c.$1,1-\dim ethylbenzene$

d.$2-pen\tan al$

e.$3-hexanoicacid$

f.$5,5-dibromo-1-cyclobu\tan ol$

Short answer

a. The "$2-chloro-2-butyne$" cannot exist because the second carbon atom contains five bonds.

a.The "$2-methyl-2-propanone$" cannot exist because the second carbon atom contains five bonds.

c. The "$1,1-\dim ethyl-benzene$" cannot exist because its first carbon atom contains five bonds.

d. The "$2-pen\tan al$" cannot exist because the aldehyde group cannot be placed at the second carbon atom.

e. The "$3-hexanoicacid$" cannot exist because the carboxylic group cannot be placed at the third carbon atom.

f. The " $5,5-dibromo-1-cyclobu\tan ol$" cannot exist because the compound does not consist of the fifth carbon atom.

Step-by-step solution

Presence of organic compound a

(a)

The following organic compound "$2-chloro-2-butyne$" cannot exist because:

By observing the molecular structure of the given compound,

one can notice that second carbon atom consists of five bonds which is impossible since carbon capacity for covalent bonding is up to four single bonds.

Therefore, that would be the main reason why the given organic compound cannot exist.

Therefore, the "$2-chloro-2-butyne$" cannot exist because the second carbon atom contains five bonds.

Presence of organic compound b:

(b)

The following organic compound "$2-methyl-2-propanone$" cannot exist because:

By observing the molecular structure of the given compound,

one can notice that the second carbon atom consists of five bonds which is impossible since carbon capacity for covalent bonding is up to four single bonds.

Therefore, that would be the main reason why the given organic compound cannot exist.

Therefore, the "$2-methyl-2-propanone$" cannot exist because the second carbon atom contains five bonds.

Presence of organic compound C:

(c)

The following organic compound"$1,1-\dim ethyl-benzene$" cannot exist because:

By observing the molecular structure of the given compound,

one can notice that first carbon atom consists of five bonds which is impossible since carbon capacity for covalent bonding is up to four single bonds.

Therefore, that would be the main reason why the given organic compound cannot exist.

Therefore, the " $1,1-\dim ethyl-benzene$" cannot exist because its first carbon atom contains five bonds.

Presence of organic compound d

(d)

The following organic compound "$2-pen\tan al$" cannot exist because:

By observing the molecular structure of the given compound,

one can notice that the second carbon atom has five bonds which is impossible since carbon capacity for covalent bonding is up to four single bonds, and by knowing the rule of the aldehyde group (carbonyl group bonded to at least one hydrogen atom),

It's possible to be positioned at the beginning or at the end of the structure.

Therefore, that would be the main reason why the given organic compound cannot exist.

Therefore, the " $2-pen\tan al$" cannot exist because the aldehyde group cannot be placed at the second carbon atom.

Presence of organic compound e

(e)

The following organic compound "$3-hexanoicacid$ " cannot exist because:

By observing the molecular structure of the given compound,

one can notice that the third carbon atom has five bonds which is impossible since carbon capacity for covalent bonding is up to four single bonds. And by knowing the rule of the carboxylic acid (carbonyl group bonded to one hydroxyl group),

It's possible to be positioned at the beginning or at the end of the structure.

Therefore, that would be the main reason why the given organic compound cannot exist.

Therefore, the "$3-hexanoicacid$" cannot exist because the carboxylic group cannot be placed at the third carbon atom.

Presence of organic compound f

(f)

The following organic compound "$5,5-dibromo-1-cyclobu\tan ol$" cannot exist because:

By observing the molecular structure of the given compound,

One can notice cyclobut which means the given compound consists of four carbon atoms in its cyclic ring, not five carbon atoms which tells us that it is impossible to have two bromine atoms at the fifth carbon atom.

Therefore, that would be the main reason why the given organic compound cannot exist.

Therefore, the " $5,5-dibromo-1-cyclobu\tan ol$" cannot exist because the compound does not consist of the five-carbon atom.