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Chemistry: Post your doubts here!

D

donewithtime80

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27 Which compound • is unaffected by hot alkaline potassium manganate(VII); • gives hydrogen when treated with sodium?

A (CH3)2CHCOCH3
B (CH3)3COH
C CH3CH2CH(OH)CH3
D CH3CO2CH(CH3)2

right answer is B ... but why not C? how is C affected bby KMnO4?
 
The Sarcastic Retard

The Sarcastic Retard

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awesomaholic101 said:
12209427_1646358245627588_1816005189_o.jpg

12/o/n/13 - where is nucleophilic addition happening?
Click to expand...
OH is a nucleophile, it will attack on aldehyde. (y) You can compare reaction with HCN :)
 
The Sarcastic Retard

The Sarcastic Retard

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donewithtime80 said:
27 Which compound • is unaffected by hot alkaline potassium manganate(VII); • gives hydrogen when treated with sodium?

A (CH3)2CHCOCH3
B (CH3)3COH
C CH3CH2CH(OH)CH3
D CH3CO2CH(CH3)2

right answer is B ... but why not C? how is C affected bby KMnO4?
Click to expand...
B is tertiary alcohol. It cant be oxidised.
C is secondary, so it will be oxidised to ketone.
Both B and C will react with Na metal as OH group is present in both. :)
 
A

awesomaholic101

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The Sarcastic Retard said:
Which question are u talking about?
Click to expand...
Generally, i mean. They ask questions like why S02 is used as food preservative ... or why MgO is used for lining refractory kilns or sth ... so do you have like a list of things and it's uses that we can go through?

The Sarcastic Retard said:
OH is a nucleophile, it will attack on aldehyde. (y) You can compare reaction with HCN :)
Click to expand...
the OH group in the ethanol ... i see. Thank you.
 
The Sarcastic Retard

The Sarcastic Retard

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awesomaholic101 said:
Generally, i mean. They ask questions like why S02 is used as food preservative ... or why MgO is used for lining refractory kilns or sth ... so do you have like a list of things and it's uses that we can go through?


the OH group in the ethanol ... i see. Thank you.
Click to expand...
No that was what my teacher made me learn in inorganic chemistry. :whistle: :p
some things are asked from IGCSE level.... (y)
 
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