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प्रश्न
‘A’ is an element having four electrons in its outermost orbit. An allotropes ‘B’ of this element is used as a dry lubricant in machinery and in pencil leads. So:
i. Write the name of element ‘A’ and its allotropes.
ii. State whether ‘B’ is a good conductor or non-conductor of electricity?
उत्तर
(i) The name of the element 'A' is carbon. The name of its allotrope is graphite.
(ii) The allotrope 'B', i.e. graphite, is a good conductor of electricity.
संबंधित प्रश्न
Define Unsaturated hydrocarbon.
Why does carbon form strong bonds with most other elements ?
What are the two properties of carbon which lead to the huge number of carbon compounds we see around us?
What will be the formula and electron dot structure of cyclopentane?
Why are certain compounds called hydrocarbons? Write the general formula for homologous series of alkanes, alkenes and alkynes and also draw the structure of the first member of each series. Write the name of the reaction that converts alkenes into alkanes and also write a chemical equation to show the necessary conditions for the reaction to occur.
Write a short note on Catenation.
Write the electron-dot structures for ethyne.
Fill in the following blank with suitable word:
The form of carbon which is used as a lubricant at high temperature is .........
Fill in the following blank with suitable word:
Ethyne has ......... carbon-hydrogen single bonds.
Giving their structures, state the number of single bonds, double bonds and triple bonds (if any) in the following compounds:
ethyne
Giving their structures, state the number of single bonds, double bonds and triple bonds (if any) in the following compounds:
ethene
Out of the following pairs of compounds, the unsaturated compounds are:
(a) C2H6 and C4H6
(b) C6H12 and C5H12
(c) C4H6 and C6H12
(d) C2H6 and C4H10
An unsaturated hydrocarbon having a triple covalent bond has 50 hydrogen atoms in its molecule. The number of carbon atoms in its molecule will be:
(a) 24
(b) 25
(c) 26
(d) 28
Write the molecular formula of an alkene having 20 carbon atoms?
What is added to groundnut oil when it is to be converted to vanaspati ghee?
Name the reaction which is usually used in the conversion of vegetables oils to fats. Explain the reaction involved in detail. Write a chemical equation to illustrate your answer.
Differentiate between alkanes and alkenes. Name and draw the structure of one member of each.
Fill in the blanks and rewrite the completed statements:
The organic compounds having double or triple bond in them are termed as _________________ _________________.
Explain the following reaction with balanced chemical equation:
Calcium reacts with water.
Identify the unsaturated compounds from the following:
- Propane
- Propene
- Propyne
- Chloropropane
Structural formula of ethyne is
The correct electron dot structure of a water molecule is
The name of the compound CH3 — CH2 — CHO is
Name the functional groups present in the following compounds
- CH3 CO CH2 CH2 CH2 CH3
- CH3 CH2 CH2 COOH
- CH3 CH2 CH2 CH2 CHO
- CH3 CH2 OH
Name the reaction which is commonly used in the conversion of vegetable oils to fats. Explain the reaction involved in detail.
Write the name of the following compound
\[\begin{array}{cc}
\phantom{}\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{..}\\
\phantom{}|\phantom{....}|\phantom{....}|\phantom{....}|\phantom{....}|\phantom{..}\\
\ce{H - C - C - C - C - C - OH}\\
\phantom{}|\phantom{....}|\phantom{....}|\phantom{....}|\phantom{....}|\phantom{..}\\
\phantom{}\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{..}
\end{array}\]
Draw the electron dot structure for ethyne.
