Chemistry
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New answer posted
a year agoContributor-Level 10
This is a multiple choice answer as classified in NCERT Exemplar
Option (iii) and (iv)
H+ does not exist freely and is always associated with other atoms or molecules. It has an extremely high ionisation enthalpy and does not have metallic properties under normal conditions, unlike alkali metals.
New answer posted
a year agoContributor-Level 10
This is a multiple choice answer as classified in NCERT Exemplar
Option (i)
Group 6
From group 6, only chromium forms CrH.
New answer posted
a year agoContributor-Level 10
1. Di-tertbutyl, ketone 2. +I effect donates e- . Br group will show +I effect along the chain but as I effect is distance dependent effect it will die as the distance increase.+I effect of alkyl group will reduce the acidity of a compound whereas –I effect will increase the acidity, I effects are distance dependent, correct order will be (CH3)2CHCOOH< CH3CH2CH2COOH< CH3CH (Br)CH2COOH < CH3CH2CH (Br)COOH. 3. As we know the electron releasing groups (ERG) reduces the acidic strength of the compound (via inductive effect) whereas the electron withdrawing group (EWG) will increase the acidic strength of compound, and methoxy group is
New answer posted
a year agoContributor-Level 10
This is a multiple choice answer as classified in NCERT Exemplar
Option (i)
Groups 7,8, 9
Explanation: The metals belonging to group 7, 8 and 9 do not have tendency to form hydrides.
New answer posted
a year agoContributor-Level 10
ANSWER: Given compound is having 8 carbons, and on reaction with chromic acid C is converted back into B, as chromic acid reaction couldn't add any carbon hence both alcohol and acid must contain 4 carbons and it is given in the question that on dehydration C will give but-1-ene so alcohol will be butan-1-ol (C) and acid will be butan-1-oic acid (B) and given reaction will be ester hydrolysis,
New answer posted
a year agoContributor-Level 10
Since the given compound with molecular formula C9H10O form a 2,4-DNP derivative and reduce Tollen's reagent, it must be an aldehyde. Since it undergoes cannizzaro reaction, therefore CHO group is directly attached to the benzene ring.
Since on vigorous oxidation, it gives 1,2-benzene dicarboxylic acid, therefore it must be ortho-substituted benzaldehyde. The only o-substituted aromatic aldehyde having molecular formula C9H10O is o—ethyl benzyldehyde all the reaction can show now be explained on the basis of this structure-
New answer posted
a year agoContributor-Level 10
This is a multiple choice answer as classified in NCERT Exemplar
Option (iii)
Na6P6O18
Sodium hexametaphosphate (Na6P6O18), commercially called 'calgon', is used to remove hardness from water.
New answer posted
a year agoContributor-Level 10
i) Taking two molecules of propanal, one which acts as a nucleophile and the other as an electrophile.
(iii) Taking one molecule each of propanal and butanal in which propanal acts as a nucleophile and butanal acts as an electrophile.
New answer posted
a year agoContributor-Level 10
This is a multiple choice answer as classified in NCERT Exemplar
Option (i)
Ca2+
Water becomes 'hard' when it contains calcium and magnesium salts in the form of hydrogen carbonate, chloride, and sulphate.
New answer posted
a year agoContributor-Level 10
This is a multiple choice answer as classified in NCERT Exemplar
Option (iv)
CO (g)+2H2 (g) → CH3OH (l)
The reaction shown in equation (iv) shows the synthesis of methanol from water gas.
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