What functional class(es) does the compound belong to? List only classes for whi

Question

What functional class(es) does the compound belong to?
List only classes for which evidence is given here. Attach no significance to evidence not cited explicitly.
Do not over-interpret exact absorption band positions. None of your inferences should depend on small differences like 10 to 20 cm-1.

Q1)

The functional groups in an organic compound can frequently be deduced from its infrared absorption spectrum. The only absorption bands this compound exhibits are 2850-3000 (m) and 1450 cm-1 (w).
Relative absorption intensity: (s)=strong, (m)=medium, (w)=weak.

Q2)

The functional groups in an organic compound can frequently be deduced from its infrared absorption spectrum. A compound contains no nitrogen and exhibits absorption bands at 3300 (s) and 2150 (m) cm-1.
Relative absorption intensity: (s)=strong, (m)=medium, (w)=weak.

(Choices)

The functional class(es) of this compound is(are) ________

a. alkane (List only if no other functional class applies.) b. alkene h. amine c. terminal alkyne i. aldehyde or ketone d. internal alkyne j. carboxylic acid e. arene k. ester f. alcohol l. nitrile g. ether

Explanation / Answer

Q1)The functional groups in an organic compound can frequently be deduced from its infrared absorption spectrum. The only absorption bands this compound exhibits are 2850-3000 (m) and 1450 cm-1 (w).
Relative absorption intensity: (s)=strong, (m)=medium, (w)=weak.

Solution :- 2850 – 3000 (m) and 1450 cm-1 (w) are the peaks for the C-H stretch in the alkanes

Therefore the Compound is the aliphatic compound that is alkane

So the answer is option ‘a’ alkane

Q2)The functional groups in an organic compound can frequently be deduced from its infrared absorption spectrum. A compound contains no nitrogen and exhibits absorption bands at 3300 (s) and 2150 (m) cm-1.
Relative absorption intensity: (s)=strong, (m)=medium, (w)=weak.

Solution :-

3300 (s) cm-1 is the peak for the C-H stretch in alkyne

2150 cm-1 peak is the characteristic peak for the carbon carbon triple bond

Therefore the compound is the alkyne

The correct answer is option ‘d’ internal alkyne.

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