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Chemistry: Post your doubts here!

Messages
500
Reaction score
419
Points
73
For statement 1 The following website will help you understand it in a more better way
https://www.chemguide.co.uk/mechanisms/nucadd/hcn.html
5454-png.63710


Thus, Statement 1 correct.

For statement 2 :
The initiating step is the nucleophile CN- attacking the partial positive carbon NOT the proton (H+) being transferred to oxygen.
For statement 3 :
Only aldehydes or ketone react with the Cyanide ion not esters. ( thus only one group reacts)
 
Messages
500
Reaction score
419
Points
73
View attachment 63988
Sorry for asking too many questions :)
Can you explain the above one
What is the reason behind slower reaction
Ans is D

No it's ok.

At first the concentration decreased from 1.0 to 0.5 thus, slow reaction.
Calculate the number of moles for both reaction in second reaction more number of moles are produced thus more product will be formed
Option D.
 
Messages
6
Reaction score
2
Points
3
Oct-1-ene, CH3(CH2)5CH=CH2, can be thermally cracked. Which combination of compounds W, X, Y and Z can be obtained by thermally cracking oct-1-ene?

W CH2=CH2
X CH3CH=CH2
Y CH3CH2CH3
Z CH2=CHCH=CH2

A W, X, Y and Z
B W, X and Y only
C W, X and Z only
D W and X only
 
Messages
1
Reaction score
0
Points
1
in an experiment a sample of a pure gas is put into a gas syringe at a temperature of 300K and pressure of 16 kpa. the gas is compressed until the volume occupied by the gas is halved.
after the compression, the temperature of the gas in syringe is 375 and the pressure is 40 kpa.
is the gas is ideal
 
Messages
500
Reaction score
419
Points
73
Oct-1-ene, CH3(CH2)5CH=CH2, can be thermally cracked. Which combination of compounds W, X, Y and Z can be obtained by thermally cracking oct-1-ene?

W CH2=CH2
X CH3CH=CH2
Y CH3CH2CH3
Z CH2=CHCH=CH2

A W, X, Y and Z
B W, X and Y only
C W, X and Z only
D W and X only

You are not supposed to focus on how the thing is formed just the products should have carbon and hydrogen less than the original compound.Any combination can be produced thus the answer is A.
Examination report:
Question 24: The correct answer was A. The most commonly chosen incorrect answer was B. This suggests that many of the candidates’ decisions rested on whether or not CH2=CHCH=CH2 can be formed. This compound can be formed in the reaction CH3(CH2)5CH=CH2 → CH3(CH2)2CH3 + CH2=CHCH=CH2 hence the answer A.
 
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