How many secondary carbon and hydrogen atoms are present in the given molecule below respectively?
A.\[2,\,3\]
B.\[2,\,2\]
C.\[3,\,3\]
D.\[2,\,0\]

Last updated date: 29th Mar 2023
•
Total views: 207.6k
•
Views today: 1.84k
Answer
207.6k+ views
Hint: Carbon atom which is attached to two different carbon atoms or bonded with two alkyl groups is known as secondary carbon and hydrogen atoms bonded to the secondary carbon are known as secondary hydrogen atoms.
Complete answer:
Carbon atoms are classified as the number of alkyl groups attached to the carbon atom. There are majorly three classifications which are as follows:
Primary carbon: Also known as \[{1^o}\] carbon. It is the carbon atom which is bonded with three hydrogen atoms and one alkyl group. These are very reactive to give bimolecular nucleophilic reactions. Example: \[R - C{H_3}\].
Secondary carbon: Also known as \[{2^o}\] carbon. It is the carbon atom which is bonded with two hydrogen atoms and two alkyl groups. These can undergo both bimolecular as well as unimolecular nucleophilic reactions. Example: \[R - C{H_2} - R\].
Tertiary carbon: Also known as \[{3^o}\] carbon. It is the carbon atom which is bonded with one hydrogen atom and three alkyl groups. These are very reactive to give unimolecular nucleophilic reactions. Example:
For the given molecule,
The carbon atoms marked with asterisk are the secondary carbon atoms because each of the marked carbon atoms is connected with two alkyl groups. Therefore, there are two secondary carbon atoms in the given molecule.
Now, as we know that a number of hydrogens attached to secondary carbon are termed as secondary hydrogen atoms. So, according to the given formula of the compound,
There are two hydrogen atoms attached to the secondary carbon. Therefore, two secondary hydrogen atoms are present in the molecule.
So, option (B) is the correct answer.
Note:
Ensure that you are not counting the functional group bonded with the carbon atom while finding its degree because the functional group has no role to decide whether the compound is primary, secondary or tertiary. It can only be decided by the number of alkyl groups present.
Complete answer:
Carbon atoms are classified as the number of alkyl groups attached to the carbon atom. There are majorly three classifications which are as follows:
Primary carbon: Also known as \[{1^o}\] carbon. It is the carbon atom which is bonded with three hydrogen atoms and one alkyl group. These are very reactive to give bimolecular nucleophilic reactions. Example: \[R - C{H_3}\].
Secondary carbon: Also known as \[{2^o}\] carbon. It is the carbon atom which is bonded with two hydrogen atoms and two alkyl groups. These can undergo both bimolecular as well as unimolecular nucleophilic reactions. Example: \[R - C{H_2} - R\].
Tertiary carbon: Also known as \[{3^o}\] carbon. It is the carbon atom which is bonded with one hydrogen atom and three alkyl groups. These are very reactive to give unimolecular nucleophilic reactions. Example:

For the given molecule,

The carbon atoms marked with asterisk are the secondary carbon atoms because each of the marked carbon atoms is connected with two alkyl groups. Therefore, there are two secondary carbon atoms in the given molecule.
Now, as we know that a number of hydrogens attached to secondary carbon are termed as secondary hydrogen atoms. So, according to the given formula of the compound,

There are two hydrogen atoms attached to the secondary carbon. Therefore, two secondary hydrogen atoms are present in the molecule.
So, option (B) is the correct answer.
Note:
Ensure that you are not counting the functional group bonded with the carbon atom while finding its degree because the functional group has no role to decide whether the compound is primary, secondary or tertiary. It can only be decided by the number of alkyl groups present.
Recently Updated Pages
Most eubacterial antibiotics are obtained from A Rhizobium class 12 biology NEET_UG

Salamin bioinsecticides have been extracted from A class 12 biology NEET_UG

Which of the following statements regarding Baculoviruses class 12 biology NEET_UG

Sewage or municipal sewer pipes should not be directly class 12 biology NEET_UG

Sewage purification is performed by A Microbes B Fertilisers class 12 biology NEET_UG

Enzyme immobilisation is Aconversion of an active enzyme class 12 biology NEET_UG

Trending doubts
Difference Between Plant Cell and Animal Cell

Write an application to the principal requesting five class 10 english CBSE

Ray optics is valid when characteristic dimensions class 12 physics CBSE

Give 10 examples for herbs , shrubs , climbers , creepers

Write the 6 fundamental rights of India and explain in detail

Write a letter to the principal requesting him to grant class 10 english CBSE

List out three methods of soil conservation

Fill in the blanks A 1 lakh ten thousand B 1 million class 9 maths CBSE

Epipetalous and syngenesious stamens occur in aSolanaceae class 11 biology CBSE
