List of top Chemistry Questions asked in DUET

What is the shape and magnetic nature of permanganate ion ?

In the given structure of a compound, the correct various bond moments direction involving are shown as

Most stable carbocation is

Which one of the following alkylbromides undergoes most rapid solvolysis in methanol solution to give corresponding methyl ether?

Which will undergo fastest $82$ substitution reaction when treated with $NaOH$?

Which ion has the largest radius?

The correct decreasing order of dipole moment in $ CH_{3}Cl,\,CH_{3} Br$ and $ CH_{3}F $ is

In Tollens test, aldehydes

Decreasing order of reactivity of hydrogen halide acids in the conversion of $ ROH\to RX $ is

In the conversion of

For a first order reaction, the time required for $99.9\%$ of the reaction to take place is nearly

In the reaction given below, $X $ is $C_6H_5MgBr + CH_3OH \longrightarrow X$

The radius of an electron orbit in a hydrogen atom is of the order of

The lock and key model of enzyme action illustrates that a particular enzyme molecule

The effectiveness of an enzyme is affected least by

It is believed that atoms combine with each other such that the outermost shell acquires a stable configuration of $8$ electrons. If stability were attained with $6$ electrons rather than $8$; what would be the formula of the stable fluoride ion?

In the change of $NO \, \to\, NO^+$ the electron is added to

Which of the following reactions will not result in the formation of carbon-carbon bonds ?

The value of electronegativity of /atoms $A$ and $B$ are $1.2$ and $4.0$ respectively. The $\%$ ionic character of the $A - B$ bond is

Aldol condensation does not occur between

Which one of the following ions has the highest value of ionic radius ?

The synthesis of complex molecules from simple molecules was proved by

Which of the following is used as an antibiotic?

Which of the following false for tetrahedral complexes?

the reagents used in the conversion are