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kirza4 [7]
3 years ago
5

Which compound has the lowest pka? (ch3ch2o2c)2ch2 ch3ch2o2cch2cho ch3ch2coch2cho phcoch2coch3 (nc)2ch2?

Chemistry
1 answer:
nexus9112 [7]3 years ago
6 0

Aldehydes having the lowest pKa value around 17 and thus the other carbonyl have higher pKa than aldehyde.

Now, two aldehyde are present in given sereis such as

ch3ch2o2cch2cho and ch3ch2coch2cho

ch3ch2coch2cho is more acidic or having low pKa than ch3ch2o2cch2cho due to the presence of carbonyl at alpha position of aldehyde and rasonance will take place in ch3ch2coch2cho which result in release of proton readilly.

Hence, ch3ch2coch2cho having low pKa value of all and thus is highly acidic of all.

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Which compound is most likely to follow second-order kinetics in a substitution reaction? (ch3)2chbr ch3ch2br (ch3)3cch2br ch3br
Inga [223]

Substitution reaction<span> monitors second-order kinetics; that is, the degree of the reaction hinge on on the concentration of two first-order reactants. In the circumstance of bimolecular nucleophilic </span>substitution, these two reactants are the nucleophile and the haloalkane. So for this problem, the answer is ch3br.

4 0
4 years ago
Calculate the equilibrium constant for the decomposition of water 2h2o(l)  2h2(g) + o2(g) at 25°c, given that g°f (h2o(l)) = –
kow [346]

Answer:

2.6 ×10^-42

Explanation:

From

∆G= -RTlnK

∆G= -237.2 KJmol-1 or -237.2×10^3 Jmol-1

R= 8.314 Jmol-1K-1

T= 25°C + 273= 298K

-237.2×10^3= 8.314 × 298 × ln K

ln K= -237.2×10^3/2477.572

K = 2.6 ×10^-42

3 0
4 years ago
Draw the most stable resonance structure for the intermediate in the electrophilic aromatic bromination of aniline, anisole, and
ASHA 777 [7]

Answer:

Here's what I get

Explanation:

(a) Intermediates

The three structures below represent one contributor to the resonance-stabilized intermediate, in which the lone pair electrons on the heteroatom are participating (the + charge on the heteroatoms do not show up very well).

(b) Relative Stabilities

The relative stabilities decrease in the order shown.

N is more basic than O, so NH₂ is the best electron donating group (EDG) and will best stabilize the positive charge in the ring. However, the lone pair electrons on the N in acetanilide are also involved in resonance with the carbonyl group, so they are not as available for stabilization of the ring.

(c) Relative reactivities

The relative reactivities would be

C₆H₅-NH₂ >  C₆H₅-OCH₃ > C₆H₅-NHCOCH₃

4 0
3 years ago
Which characteristic is a property of water?
Rus_ich [418]

Answer: The correct answer is option (A).

Explanation:

Polar molecules are molecules in which formation of partial charges takes place due to which dipole moment gets created in a molecule. Molecules with polar bonds that s bond with partly ionic character. And water is of the example of polar molecule.

Electronegative oxygen atom in water molecule attracts the electron bond pair towards itself which generates partial negative charge on oxygen atom and partial positive charge on both hydrogen atoms.

Where as water has higher value surface tension due to strong intermolecular association of the water molecule due to presence of hydrogen bonding.And it is more denser is liquid state than in its solid state.

Hence,the correct answer is option (A).

 

5 0
4 years ago
Which of the following pairs of elements belong to the same group
ale4655 [162]
C. C and Pb; Carbon and Lead being in the same group.
5 0
3 years ago
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