Question:
The wave number for C=C (carbon-carbon double bond) stretching is ($10\times10^{5}$ dyne cm):
The wave number for C=C (carbon-carbon double bond) stretching is ($10\times10^{5}$ dyne cm):
Show Hint
C=C Stretch range: 1600-1680 $cm^{-1}$.
Updated On: May 25, 2026
- 1820 cm-1
- $1967~cm^{-1}$
- $1680~cm^{-1}$
- $1537~cm^{-1}$
Show Solution
Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Concept
Infrared (IR) spectroscopy identifies functional groups based on the absorption of radiation that causes molecular vibrations.
Step 2: Meaning
The wave number ($\bar{\nu}$) corresponds to the frequency of the vibration and depends on bond strength and atom mass.
Step 3: Analysis
Standard IR tables place the C=C stretching frequency in the range of 1600–1680 $cm^{-1}$. Carbonyl groups (C=O) typically appear higher (1700+), and triple bonds appear even higher (2100+).
Step 4: Conclusion
Among the options, 1680 $cm^{-1}$ falls within the characteristic range for an alkene double bond stretch. Final Answer: (c)
Infrared (IR) spectroscopy identifies functional groups based on the absorption of radiation that causes molecular vibrations.
Step 2: Meaning
The wave number ($\bar{\nu}$) corresponds to the frequency of the vibration and depends on bond strength and atom mass.
Step 3: Analysis
Standard IR tables place the C=C stretching frequency in the range of 1600–1680 $cm^{-1}$. Carbonyl groups (C=O) typically appear higher (1700+), and triple bonds appear even higher (2100+).
Step 4: Conclusion
Among the options, 1680 $cm^{-1}$ falls within the characteristic range for an alkene double bond stretch. Final Answer: (c)
Was this answer helpful?
0
0
Top GPAT Pharmacy Questions
- Glycogenic amino acids enter TCA cycle except:
- The most active estrogen found naturally in the human body is:
- The diuretic action of Triamterene on the distal convoluted tubule and collecting duct is due to inhibition of:
- Adverse drug reaction of cyclophosphamide is a hemorrhagic cystitis is minimized by:
- Ritodrine and Isoxsuprine work as a tocolytic by the:
View More Questions
Top GPAT Pharmaceutical Analysis Questions
- In limit test of arsenic internal diameter of glass tube:
- Which indicator is used for the determination of magnesium and calcium in complexometric titration:
- If the Hammett equation constant ($\sigma$) is negative, it indicates:
- Potassium permanganate ($KMnO_{4}$) is called a self-indicator because:
- The principle of nephelometry is based on:
View More Questions
Top GPAT Questions
- Match the symbols in the List I with the terms used in the List II of conductance measurements, and
List I
SymbolsList II
TermsA \(\Omega^{-1}\) I Specific conductance B \(∧\) II Electrical conductance C k III Specific resistance D \(\rho\) IV Equivalent conductance
Choose the correct answer from the options given below: - Cottrell’s method is used for the measurement of:
- Match the statements in List I with their correct answers in List II, respectively, in respect to modified 1st law of thermodynamics, and
List I
List II
A Constant heat (q = 0) I Isothermal B Reversible process at constant temperature (dT = 0) II Isometric C Constant volume (dV = 0) III Adiabatic D Constant pressure (dP = 0) IV Isobar
Choose the correct answer from the options given below: - Boric acid with molecular weight 61.83 was partitioned between water and amyl alcohol at 25 °C. The amount of boric acid was determined to be 0.24 g in 250 ml of amyl alcohol and 0.32 g in 100 ml water. The partition coefficient of boric acid between water and amyl alcohol, when calculated at molar concentration for each of the solution, is:
- Drugs ‘A’, ‘B’ and ‘C’ follow zero order, first order and second order degradation kinetics, respectively, but have the same rate constant. Which of the following statement is true in this respect:
View More Questions