HSC Science (Electronics) 12th Standard Board Exam - Maharashtra State Board Important Questions for Chemistry

Mention the number of unpaired electrons and geometry of the following complex:

\[\ce{[Ni(CN)4]^2-}\]

Write the name of a hexadentate ligand. 

Identify the product ‘D’ in the following sequence of reactions:

\[\ce{H3C - CH2 - CH2 - Cl \underset{KOH}{\overset{Alc}{->}} 'B' \overset{HBr}{->} 'C' \underset{Elther}{\overset{Na}{->}}'D'}\]

Identify ‘A’ and ‘B’ in the following reaction :

\[\ce{CH3 - CH = CH2 ->[HBr]'A' ->[alc.KOH]'B'}\]

State and explain Markownikoff's rule with suitable example

How are the following conversions carried out?

2-methylbutan-1-ol into 2 -methylbutanoic acid.

But-1-ene on reaction with HCl in the presence of sodium peroxide yields _______.

IUPAC name of is C₆H₅ − CH₂ − C − CH₂ − CH₂ − CH₂ − CH₃ is _______

(A) 1-Phenylhexan-2-one

(B) 6-Phenylhexan-5-one

(C) 1-Benzylhexan-5-one

(D) Dodecan-5-one

How is nitromethane prepared from the following?

alkyl halide

How is nitromethane prepared from the following?

α-nitroalkene

Draw a neat, labelled energy profile diagram for SN¹ reaction mechanism.

Complete and rewrite the balanced chemical equations

What are racemates?

Give reason:

Reactions involving Grignard reagent must be carried out under anhydrous condition.

Give reason:

Alkyl halides are generally not prepared by free radical halogenation of alkanes.

Complete the following reaction sequence by writing the structural formulae of the organic compound 'A', 'B' and 'C'.

\[\ce{2-Bromobutane->[Alc.KOH]A->[][Br2]B->[][NaNH2]C}\]

The following will react faster by S_N1 mechanism

Name the reagent used to convert alkyl halide to ester.

Explain. Aryl halides are less reactive than alkyl halides towards nucleophilic substitution reactions.

Explain optical activity of 2-chlorobutane.