Multiple Choice QuestionsWhat products are formed when the following compounds is treated with Br2 in the presence of FeBr3?
In the following sequence of reactions,
the end product is (C) is
acetone
methane
acetaldehyde
acetaldehyde
Which of the following reaction (s) can be used for the preparation of alkyl halides?
I, III and IV
I and II
Only IV
Only IV
In an SN1 reaction on chiral centres, there is
100% racemisation
inversion more than retention leading to partial racemization
100% retention
100% retention
The order of reactivity of phenyl magnesium bromide (phMgBr) with the following compounds.
III > II> I
II > I > III
I > III > II
I > III > II
D.
I > III > II
Since alkyl group has +I -effect and aryl group has +R - effect, thus, greater the number of alkyl and aryl groups attached to the carbonyl group, its reactivity towards nucleophilic addition reaction. Secondly, as the steric crowding on carbonyl group increases, the reactivity decreases accordingly.
therefore, correct reactivity order for reaction with PhMgBr is
The IUPAC name of the following compound
trans - 2- chloro - 3 - iodo - 2 - pentene
cis - 3- iodo - 4- chloro - 3- pentene
trans - 3- iodo - 4- chloro - 3- pentene
trans - 3- iodo - 4- chloro - 3- pentene
Consider the reactions
The mechanisms of reactions (i) and (ii) are respectively
SN1 and SN2
SN1 and SN1
SN2 and SN2
SN2 and SN2
In the reaction with HCl, an alkene reacts in accordance with the markownikoff's rule, to give a product 1-chloro -1- methylcyclohexane. The possible alkane is
(a) and (b)
(a) and (b)
2,3 -dimethyl - 2- butene can be prepared by heating which of the following compounds with a strong acid?
(CH3)2CH-CH(CH)3-CH=CH2
(CH3)3C-CH=CH2
(CH3)2C =CH-CH2-CH3
(CH3)2C =CH-CH2-CH3
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