Question

How many $2{}^\circ$ hydrogens atoms are present in the given compound?

(A) 2
(B) 5
(C) 7
(D) 8

Answer 1

The carbons attached to one other carbon and having usually 3 hydrogens, in this case, are called primary carbons. The carbon attached to two other carbon is called a secondary carbon. The carbons attached to three other carbons are called a tertiary carbon. The carbons attached to four other carbons are called quaternary carbons.

Complete step by step solution:
-The name for the carbon depends on the number of carbons directly attached to carbon (marked with red), not on the hydrogens.

-Same terminology we can apply for hydrogen atoms also. The hydrogens attached to primary carbon are called Primary hydrogens. The hydrogens attached to secondary carbon are called secondary hydrogens. The hydrogens attached to tertiary carbon are called tertiary hydrogen. The hydrogens marked with red colour are primary, the hydrogens marked with green are secondary hydrogen and the hydrogens marked with blue colour are tertiary hydrogens.

-Based on the above knowledge, let us now try to identify different types of carbon and hydrogen atoms in the molecule given to us.

The carbon and hydrogen atoms marked with green colour are secondary carbons and hydrogens. The carbon and hydrogen marked with blue colour are tertiary carbons and hydrogens.
So, it is clear that we have seven secondary hydrogens in the given molecule.

Hence, the correct answer is option C.

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