List of practice Questions

The mean weight of a group of 10 items is 28 and that of another group of n items is 35. The mean of combined group of 10 + n items is found to be 30. The value of n is

The most stable measure of central tendency is

$ C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}OH $ and $ {{H}_{3}}CC{{H}_{2}}OC{{H}_{3}} $ are:

Number of stereoisomers of lactic add is

$0.92 \,g$ of an organic compound was analysed by combustion method. The mass of the $U$-tube increased by $1.08 \,g$. What is the percentage of hydrogen in the compound?

Consider the following carbocations : I. $Cl_3 \overset{+}C$ II. $Cl_{2} \overset{+} {C}H$ III. $Cl \overset{+} {C}H_{2}$ IV. $ \overset{+} {C}H_{3}$ The stability sequence follows the order

$1$-Butene and cyclobutane show

59 g of an amide obtained from a carboxylic acid, RCOOH, upon heating with alkali liberated 17 g of ammonia. The acid is

A compound with molecular formula $C_4H_4O$ has all the four carbon atoms and the oxygen atom inthe ring. It also has two double bonds. The compound is

A gas is found to have the formula (CO)$^n$. If its vapour density is 56, the value of n will be

A mixture of acetone (b.p. 56$^\circ$) and methanol (b.p. 65$^\circ$) can be separated by

A mixture of benzoic acid and naphthalene can be separated by crystallization from

A mixture of two immiscible liquids may be easily separated by using a

An example of alicyclic compound is

An organic compound contains $69\%$ carbon and $4.8\%$ hydrogen, the remainder being oxygen. What will be the masses of carbon dioxide and water produced when $0.20 \,g$ of this substance is subjected to complete combustion.

Aniline is insoluble in water and processes low vapour pressure. It can be purified by

Aniline is usually purified by

Arrange the following alkyl bromides in decreasing order of rates of $S_N2$ displacement reaction.

In the case of polyfunctional compounds, the choice of principal functional group is made on the basis of order of preference. The order of decreasing priority for some functional groups is

Nitroalkanes and alkyl nitrites exhibit functional isomerism. Compounds having same molecular formula but different functional groups are called functional isomers.

Paper chromatography is a type of partition chromatography. Moving phase is liquid and stationary phase is solid.

When inductive and electromeric effects operate in opposite directions, the inductive effect predominates. Inductive effect is the complete transfer of shared pair of $\pi$ electrons to one of the atoms.

Bond length of ethane (I), ethene (II), acetylene (III) and benzene (IV) follows the order

Carbanion is iso-structural with

Dehydration of ethyl alcohol proceeds via