Ans :
Double bonds are the covalent bonds that are formed by sharing of two electrons.
The strength of bond is inversely related to the bond length. The double bond is shorter in length than the single bond and hence more rigid.
The peptide bond is also a covalent bond that has a little double bond character and hence also rigid but less than double bond.
Why are double bonds and peptide bonds more rigid than single bonds?
1. Why are double bonds and triple bonds shorter than single bonds? 2. VSEPR geometry predicts that the bond angles in formaldehyde (CH20), a trigonal planar molecule, will be 120° throughout all three angles. However, analysis showed that the H-C-H bond angle is slightly smaller at 116.5°, while the two H-C-O angles are slightly larger at 121.8°. Explain this difference in the predicted bond angle vs actual bond angle. 3. VSEPR geometry also predicts that the bond angles in tetrahedral molecules is...
Why is the peptide bond is considered rigid and planar? Please explain.
An explanation as to why S atoms tend to form single S-S bonds rather than the double bonds observed in O2.
Why is quadruple precision (128 bits) more than twice as accurate as double precision (64-bit), which is in turn more than twice as accurate as single precision (32-bit)?
The central atom in IF2 is surrounded by no single bonds, 2 double bonds, and no lone pairs of electrons. 1 single bond, 1 double bond, and 1 lone pair of electrons. 2 single bonds, no double bonds, and 3 lone pairs of electrons. no single bonds, 2 double bonds, and 2 lone pairs of electrons. O 3 single bonds, no double bonds, and 2 lone pairs of electrons.
Remote double bonds, (double bonds out in the middle of long chains) are more commonly prepared by Wittig reactions rather than by elimination. Explain. Example:
Monounsaturated fatty acids have a single double bond. Polyunsaturated fatty acids have multiple double bonds. Which of the following statements is true? A. Monounsaturated fatty acids store more energy than polyunsaturated fatty acids. B. Polyunsaturated fatty acids store more energy than monounsaturated fatty acids. C. Polyunsaturated fats have a lower melting point than monounsaturated fatty acids. D. Monounsaturated fats have a lower melting point than polyunsaturated fatty acids.
Why are government bonds considered more liquid than corporate stocks? Select one: a. Bonds are easier to purchase than corporate stocks b. The bonds market is larger (is worth more money) than the stock market c. Bonds can be sold more quickly than stocks d. Bonds do not fluctuate in price as much as stocks e. Bonds and stocks are actually equally liquid
A. Double bonds that are connected by a single bond are said to be conjugated. For each molecule below, indicate how many conjugated double bonds are present in each molecule. HO OH bro HO B. One feature that distinguishes conjugated dienes from isolated dienes is that the C-C bond joining the two double bonds is unusually short. For each of the molecules in Part A, indicate which C-C single bond(s) might be shorter than expected. C. Some reactions of conjugated...
Why is it difficult to assign a single geometry to a molecule with more than one central atom?