Create a raw transaction and broadcast it to blockchain using bitcoin core I have a address- n3xYQtxvVwpBPSbgGsGRdMWz1YTUjakiMV, amount  that i want to send-1 BTC and i have a private key. How can i create a raw transaction using it and broadcast it to blockchain using bitcoin core.

I have tried this command:

bitcoin-cli createrawtransaction '[{"txid":"dbdc2e2c7f143af70c5e7e8725f55d226b3c058d7bf34a303‌​091b3c6a514848c","vo‌​ut":1}]' '{"n3xYQtxvVwpBPSbgGsGRdMWz1YTUjakiMV":1}' 


and this: bitcoin-cli sendrawtransaction XXX
EDIT: based on OPs request, I put examples in here:

there are a lot of examples for different tx types on bitcoin.org, in the developer examples. Basically you will need three steps. Assuming you are on OpenBSD/MacOS/Linux, you can go this way:

1.) createrawtransaction - this is what you have already, and it looks ok. I don't know if the previous tx ID or v_out is correct, assuming you know the details, your string is ok (otherwise check with "bitcoin-cli -regtest listunspent", and adopt TX_ID and V_OUT accordingly). I also assume, that the address is one which is in your wallet. Otherwise you might just create an address, and proceed afterwards like this:

UTXO_TXID=dbdc2e2c7f143af70c5e7e8725f55d226b3c058d7bf34a303‌
UTXO_VOUT=1
NEW_ADDRESS=n3xYQtxvVwpBPSbgGsGRdMWz1YTUjakiMV
bitcoin-cli -regtest createrawtransaction '''
    [
      {
        "txid": "'$UTXO_TXID'",
        "vout": '$UTXO_VOUT'
      }
    ]
    ''' '''
    {
      "'$NEW_ADDRESS'": 1
    }'''


you provide this returned hex string to another variable: 

RAW_TX=01000...


2.) signrawtransaction - the previous command returns a hex string, that you will use to sign the transaction - again, see the docs. First I verify my created tx, and then sign: 

bitcoin-cli -regtest decoderawtransaction $RAW_TX
bitcoin-cli -regtest signrawtransaction $RAW_TX


again you assign the result to a variable: 

SIGNED_RAW_TX=01000...


3.) sendrawtransaction - again you take the hexstring of the previous command as parameter, and/or see the docs.

bitcoin-cli -regtest sendrawtransaction $SIGNED_RAW_TX


and maybe a verification as step 4:

bitcoin-cli -regtest generate 1


this generates a block, and you can see on the $NEW_ADDRESS, if funds have been transferred. 

I just entered the two keywords here in the search function, and also found a lot of answers.