Organic chemistry-some basic principles and techniques practice · Mixed difficulty

Identify the substitute group, that acts as ortho-para director, during electrophilic substitution in aromatic compounds.

A hydrocarbon contains 10.5 g carbon and 1 g hydrogen. Its 2.4 g has 1 L volume at 1 atm and 127$^ \circ$C. Hydrocarbon is

A secondary(${2^ \circ }$) carbon is one that is joined to :

An organic compound contains, C, H and S. When C and H are to be estimated the combustion tube at the exit should contain a:

The prefix name of —SH group in IUPAC system is :

Which of the following species is not electrophile in nature

Arrange in decreasing order of $+\mathrm{R}$ power in the given groups

I) $-\mathrm{NH}_2$

II) $-O^{\Theta}$

III) $-\mathrm{OH}$

IV) $-\mathrm{NHCOCH}_3$

In Kjeldahl’s method of estimation of nitrogen, ${\mathrm{K}_2}\mathrm{S}{\mathrm{O}_4}$ acts as:

Which conformation of butane will have the minimum energy

Cyclohexane is :

The compound formed in the positive test for nitrogen with the Lassaigne solution of an organic compound is

Which of the following statement(s) is/are correct ?

(i) A carbon atom having an $s p$ hybrid orbital is less electronegative than carbon atoms possessing $s p^2$ or $s p^3$ hybridised orbitals.

(ii) $\pi$-bonds provide the most reactive centres in the molecules containing multiple bonds

(iii) The number of $\sigma$ and $\pi$ bonds in compound ${CH}_2={C}={CHCH}_3$ are 7 and 2 respectively.

Increasing order of stability of radicals is

Correct IUPAC structure for the given organic compound is 2,2-Dibromo-1-phenylpentane

In Carius method of 0.099 g orgainc compound gave 0.287 g $\mathrm{AgCl}$. The percentage of chlorine in the compound will be

An organic compound is fused with fusion mixture and extracted with $\mathrm{HN}{\mathrm{O}_3}$. The extract gives yellow precipitate with ammonium molybdate. It show the presence of which element?

Most stable carbocation among the following is

Formulae of phenyl carbinol and chloral are respectively :

Detection of phosphorus in the compound can be done by its conversion into phosphate. Reagent to identify phosphate ion is

Which of the following species is most stable?

Which of the following have incorrect molecular formula?

A. Icosane $- {C}_{10} {H}_{22}$

B. Triacontane $-{C}_{30} {H}_{62}$

C. Nonane - ${C}_9 {H}_{20}$

D. Heptane $- {C}_7 {H}_{14}$

3-phenylpropenoic acid is IUPAC name of :

Shifting of electrons of a multiple bond under the influence of a reagent is called :

Select the organic compound which was prepared for the first time in laboratory from its elements :

Which of the following has $+ R$ effect

Which of the following statements is not characteristic of free radical chain reaction?

The ${\mathrm{S}_\mathrm{N}}1$ mechanism for substitution reaction by nucleophile is favoured by :

The number of isomeric pentyl alcohols possible is

Which of the following group shows $+ I$. effect

(i) $\mathrm{F}_3 \mathrm{C}-\mathrm{COOH}$

(ii) $\mathrm{CH}_3-\mathrm{COOH}$

(iii) $\mathrm{C}_6 \mathrm{H}_5-\mathrm{COOH}$

(iv) $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{COOH}$

Correct order of $\mathrm{pK}_{\mathrm{a}}$ value is: