In an S_N1 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

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

• S_N1 and S_N2

• S_N1 and S_N1

• S_N2 and S_N2

• S_N2 and S_N2

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

Which one is most reactive towards S_N1 reaction?

• C₆H₅CH(C₆H₅)Br

• C₆H₅CH(CH₃)Br

• C₆H₅C(CH₃)(C₆H₅)Br

• C₆H₅C(CH₃)(C₆H₅)Br

In the following reaction,  the product 'X' is

• C₆H₅CH₂OCH₂C₆H₅

• C₆H₅CH₂OH

• C₆H₅CH₃

• C₆H₅CH₃

Which of the following reactions is an example of nucleophilic substitution reaction?

• RX + KOH → ROH + KX

• 2RX + 2Na → R- R 

• RX + H₂ → RH + HX

• RX + H₂ → RH + HX

Consider the following reaction,



the product Z, is

• CH₂ = CH₂

• CH₃CH₂-O-CH₂-CH₃

• CH₃-CH₂-O-SO₃H

• CH₃-CH₂-O-SO₃H